Deforestation

Deforestation, clearance, clearcutting or clearing is the removal of a forest or stand of trees from land which is then converted to a non-forest use.[2] Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated deforestation occurs in tropical rainforests.[3] About 31% of Earth's land surface is covered by forests.[4]

Satellite image of deforestation in progress in eastern Bolivia. Worldwide, 10% of wilderness areas were lost between 1990 and 2015.[1]

Deforestation over time

The primary cause of deforestation is agriculture. Trees are cut down for use as building material or sold as fuel (sometimes in the form of charcoal or timber), while cleared land is used as pasture for livestock and plantation. The vast majority of agricultural activity resulting in deforestation is subsidized by government tax revenue.[5] Disregard of ascribed value, lax forest management, and deficient environmental laws are some of the factors that lead to large-scale deforestation. Deforestation in many countries—both naturally occurring[6] and human-induced—is an ongoing issue.[7] Between 2000 and 2012, 2.3 million square kilometres (890,000 sq mi) of forests around the world were cut down.[8]

The removal of trees without sufficient reforestation has resulted in habitat damage, biodiversity loss, and aridity. Deforestation causes extinction, changes to climatic conditions, desertification, and displacement of populations, as observed by current conditions and in the past through the fossil record.[9] Deforestation also has adverse impacts on biosequestration of atmospheric carbon dioxide, increasing negative feedback cycles contributing to global warming. Global warming also puts increased pressure on communities who seek food security by clearing forests for agricultural use and reducing arable land more generally. Deforested regions typically incur significant other environmental effects such as adverse soil erosion and degradation into wasteland. According to a study published in Nature Scientific Reports if deforestation continue in current rate in the next 20 - 40 years, it will probably trigger a full or almost full extinction of humanity. To avoid it humanity should pass from a civilization dominated by the economy to "cultural society" that "privileges the interest of the ecosystem above the individual interest of its components, but eventually in accordance with the overall communal interest"[10]

Deforestation is more extreme in tropical and subtropical forests in emerging economies. More than half of all plant and land animal species in the world live in tropical forests.[11] As a result of deforestation, only 6.2 million square kilometres (2.4 million square miles) remain of the original 16 million square kilometres (6 million square miles) of tropical rainforest that formerly covered the Earth.[8] An area the size of a football pitch is cleared from the Amazon rainforest every minute, with 136 million acres (55 million hectares) of rainforest cleared for animal agriculture overall.[12] More than 3.6 million hectares of virgin tropical forest was lost in 2018.[13] Consumption and production of beef is the primary driver of deforestation in the Amazon, with around 80% of all converted land being used to rear cattle.[14][15] 91% of Amazon land deforested since 1970 has been converted to cattle ranching.[16][17] The global annual net loss of trees is estimated to be approximately 10 billion.[18][19] According to the Global Forest Resources Assessment 2020 the global rate of net forest loss in 2010–2020 was 7 million ha per year.[20]

Causes

The last batch of sawnwood from the peat forest in Indragiri Hulu, Sumatra, Indonesia. Deforestation for oil palm plantation.

According to the United Nations Framework Convention on Climate Change (UNFCCC) secretariat, the overwhelming direct cause of deforestation is agriculture. Subsistence farming is responsible for 48% of deforestation; commercial agriculture is responsible for 32%; logging is responsible for 14%, and fuel wood removals make up 5%.[21]

Experts do not agree on whether industrial logging is an important contributor to global deforestation.[22][23] Some argue that poor people are more likely to clear forest because they have no alternatives, others that the poor lack the ability to pay for the materials and labour needed to clear forest.[22] One study found that population increases due to high fertility rates were a primary driver of tropical deforestation in only 8% of cases.[24]

Other causes of contemporary deforestation may include corruption of government institutions,[25][26] the inequitable distribution of wealth and power,[27] population growth[28] and overpopulation,[29][30] and urbanization.[31] Globalization is often viewed as another root cause of deforestation,[32][33] though there are cases in which the impacts of globalization (new flows of labor, capital, commodities, and ideas) have promoted localized forest recovery.[34]

Another cause of deforestation is climate change. 23% of tree cover losses result from wildfires and climate change increase their frequency and power.[35] The rising temperatures cause massive wildfires especially in the Boreal forests. One possible effect is the change of the forest composition.[36]

Deforestation in the Maranhão state of Brazil, 2016

In 2000 the United Nations Food and Agriculture Organization (FAO) found that "the role of population dynamics in a local setting may vary from decisive to negligible", and that deforestation can result from "a combination of population pressure and stagnating economic, social and technological conditions".[28]

The degradation of forest ecosystems has also been traced to economic incentives that make forest conversion appear more profitable than forest conservation.[37] Many important forest functions have no markets, and hence, no economic value that is readily apparent to the forests' owners or the communities that rely on forests for their well-being.[37] From the perspective of the developing world, the benefits of forest as carbon sinks or biodiversity reserves go primarily to richer developed nations and there is insufficient compensation for these services. Developing countries feel that some countries in the developed world, such as the United States of America, cut down their forests centuries ago and benefited economically from this deforestation, and that it is hypocritical to deny developing countries the same opportunities, i.e. that the poor should not have to bear the cost of preservation when the rich created the problem.[38]

Some commentators have noted a shift in the drivers of deforestation over the past 30 years.[39] Whereas deforestation was primarily driven by subsistence activities and government-sponsored development projects like transmigration in countries like Indonesia and colonization in Latin America, India, Java, and so on, during the late 19th century and the earlier half of the 20th century, by the 1990s the majority of deforestation was caused by industrial factors, including extractive industries, large-scale cattle ranching, and extensive agriculture.[40] Since 2001, commodity-driven deforestation, which is more likely to be permanent, has accounted for about a quarter of all forest disturbance, and this loss has been concentrated in South America and Southeast Asia.[41]

Environmental effects

Atmospheric

Illegal "slash-and-burn" practice in Madagascar, 2010

Deforestation is ongoing and is shaping climate and geography.[42][43][44][45]

Deforestation is a contributor to global warming,[46][47] and is often cited as one of the major causes of the enhanced greenhouse effect. Tropical deforestation is responsible for approximately 20% of world greenhouse gas emissions.[48] According to the Intergovernmental Panel on Climate Change deforestation, mainly in tropical areas, could account for up to one-third of total anthropogenic carbon dioxide emissions.[49] But recent calculations suggest that carbon dioxide emissions from deforestation and forest degradation (excluding peatland emissions) contribute about 12% of total anthropogenic carbon dioxide emissions with a range from 6% to 17%.[50] Deforestation causes carbon dioxide to linger in the atmosphere. As carbon dioxide accrues, it produces a layer in the atmosphere that traps radiation from the sun. The radiation converts to heat which causes global warming, which is better known as the greenhouse effect.[51] Plants remove carbon in the form of carbon dioxide from the atmosphere during the process of photosynthesis, but release some carbon dioxide back into the atmosphere during normal respiration. Only when actively growing can a tree or forest remove carbon, by storing it in plant tissues. Both the decay and the burning of wood release much of this stored carbon back into the atmosphere. Although an accumulation of wood is generally necessary for carbon sequestration, in some forests the network of symbiotic fungi that surround the trees' roots can store a significant amount of carbon, storing it underground even if the tree which supplied it dies and decays, or is harvested and burned.[52] Another way carbon can be sequestered by forests is for the wood to be harvested and turned into long-lived products, with new young trees replacing them.[53] Deforestation may also cause carbon stores held in soil to be released. Forests can be either sinks or sources depending upon environmental circumstances. Mature forests alternate between being net sinks and net sources of carbon dioxide (see carbon dioxide sink and carbon cycle).

In deforested areas, the land heats up faster and reaches a higher temperature, leading to localized upward motions that enhance the formation of clouds and ultimately produce more rainfall.[54] However, according to the Geophysical Fluid Dynamics Laboratory, the models used to investigate remote responses to tropical deforestation showed a broad but mild temperature increase all through the tropical atmosphere. The model predicted <0.2 °C warming for upper air at 700 mb and 500 mb. However, the model shows no significant changes in other areas besides the Tropics. Though the model showed no significant changes to the climate in areas other than the Tropics, this may not be the case since the model has possible errors and the results are never absolutely definite.[55] Deforestation affects wind flows, water vapour flows and absorption of solar energy thus clearly influencing local and global climate.

Fires on Borneo and Sumatra, 2006. People use slash-and-burn deforestation to clear land for agriculture.

Reducing emissions from deforestation and forest degradation (REDD) in developing countries has emerged as a new potential to complement ongoing climate policies. The idea consists in providing financial compensations for the reduction of greenhouse gas (GHG) emissions from deforestation and forest degradation".[56] REDD can be seen as an alternative to the emissions trading system as in the latter, polluters must pay for permits for the right to emit certain pollutants (i.e. CO2).

Rainforests are widely believed by laymen to contribute a significant amount of the world's oxygen,[57] although it is now accepted by scientists that rainforests contribute little net oxygen to the atmosphere and deforestation has only a minor effect on atmospheric oxygen levels.[58][59] However, the incineration and burning of forest plants to clear land releases large amounts of CO₂, which contributes to global warming.[47] Scientists also state that tropical deforestation releases 1.5 billion tons of carbon each year into the atmosphere.[60]

Hydrological

The water cycle is also affected by deforestation. Trees extract groundwater through their roots and release it into the atmosphere. When part of a forest is removed, the trees no longer transpire this water, resulting in a much drier climate. Deforestation reduces the content of water in the soil and groundwater as well as atmospheric moisture. The dry soil leads to lower water intake for the trees to extract.[61] Deforestation reduces soil cohesion, so that erosion, flooding and landslides ensue.[62][63]

Shrinking forest cover lessens the landscape's capacity to intercept, retain and transpire precipitation. Instead of trapping precipitation, which then percolates to groundwater systems, deforested areas become sources of surface water runoff, which moves much faster than subsurface flows. Forests return most of the water that falls as precipitation to the atmosphere by transpiration. In contrast, when an area is deforested, almost all precipitation is lost as run-off.[64] That quicker transport of surface water can translate into flash flooding and more localized floods than would occur with the forest cover. Deforestation also contributes to decreased evapotranspiration, which lessens atmospheric moisture which in some cases affects precipitation levels downwind from the deforested area, as water is not recycled to downwind forests, but is lost in runoff and returns directly to the oceans. According to one study, in deforested north and northwest China, the average annual precipitation decreased by one third between the 1950s and the 1980s.[65]

Deforestation of the Highland Plateau in Madagascar has led to extensive siltation and unstable flows of western rivers.

Trees, and plants in general, affect the water cycle significantly:[66]

their canopies intercept a proportion of precipitation, which is then evaporated back to the atmosphere (canopy interception);
their litter, stems and trunks slow down surface runoff;
their roots create macropores – large conduits – in the soil that increase infiltration of water;
they contribute to terrestrial evaporation and reduce soil moisture via transpiration;
their litter and other organic residue change soil properties that affect the capacity of soil to store water.
their leaves control the humidity of the atmosphere by transpiring. 99% of the water absorbed by the roots moves up to the leaves and is transpired.[67]

As a result, the presence or absence of trees can change the quantity of water on the surface, in the soil or groundwater, or in the atmosphere. This in turn changes erosion rates and the availability of water for either ecosystem functions or human services. Deforestation on lowland plains moves cloud formation and rainfall to higher elevations.[68]

The forest may have little impact on flooding in the case of large rainfall events, which overwhelm the storage capacity of forest soil if the soils are at or close to saturation.

Tropical rainforests produce about 30% of our planet's fresh water.[57]

Deforestation disrupts normal weather patterns creating hotter and drier weather thus increasing drought, desertification, crop failures, melting of the polar ice caps, coastal flooding and displacement of major vegetation regimes.[69]

Soil

Deforestation for the use of clay in the Brazilian city of Rio de Janeiro. The hill depicted is Morro da Covanca, in Jacarepaguá

Due to surface plant litter, forests that are undisturbed have a minimal rate of erosion. The rate of erosion occurs from deforestation, because it decreases the amount of litter cover, which provides protection from surface runoff.[70] The rate of erosion is around 2 metric tons per square kilometre.[71] This can be an advantage in excessively leached tropical rain forest soils. Forestry operations themselves also increase erosion through the development of (forest) roads and the use of mechanized equipment.

Deforestation in China's Loess Plateau many years ago has led to soil erosion; this erosion has led to valleys opening up. The increase of soil in the runoff causes the Yellow River to flood and makes it yellow colored.[71]

Greater erosion is not always a consequence of deforestation, as observed in the southwestern regions of the US. In these areas, the loss of grass due to the presence of trees and other shrubbery leads to more erosion than when trees are removed.[71]

Soils are reinforced by the presence of trees, which secure the soil by binding their roots to soil bedrock. Due to deforestation, the removal of trees causes sloped lands to be more susceptible to landslides.[66]

Biodiversity

Deforestation on a human scale results in decline in biodiversity,[72] and on a natural global scale is known to cause the extinction of many species.[9] The removal or destruction of areas of forest cover has resulted in a degraded environment with reduced biodiversity.[30] Forests support biodiversity, providing habitat for wildlife;[73] moreover, forests foster medicinal conservation.[74] With forest biotopes being irreplaceable source of new drugs (such as taxol), deforestation can destroy genetic variations (such as crop resistance) irretrievably.[75]

Illegal logging in Madagascar. In 2009, the vast majority of the illegally obtained rosewood was exported to China.

Since the tropical rainforests are the most diverse ecosystems on Earth[76][77] and about 80% of the world's known biodiversity could be found in tropical rainforests,[78][79] removal or destruction of significant areas of forest cover has resulted in a degraded[80] environment with reduced biodiversity.[9][81] A study in Rondônia, Brazil, has shown that deforestation also removes the microbial community which is involved in the recycling of nutrients, the production of clean water and the removal of pollutants.[82]

It has been estimated that we are losing 137 plant, animal and insect species every single day due to rainforest deforestation, which equates to 50,000 species a year.[83] Others state that tropical rainforest deforestation is contributing to the ongoing Holocene mass extinction.[84][85] The known extinction rates from deforestation rates are very low, approximately 1 species per year from mammals and birds which extrapolates to approximately 23,000 species per year for all species. Predictions have been made that more than 40% of the animal and plant species in Southeast Asia could be wiped out in the 21st century.[86] Such predictions were called into question by 1995 data that show that within regions of Southeast Asia much of the original forest has been converted to monospecific plantations, but that potentially endangered species are few and tree flora remains widespread and stable.[87]

Scientific understanding of the process of extinction is insufficient to accurately make predictions about the impact of deforestation on biodiversity.[88] Most predictions of forestry related biodiversity loss are based on species-area models, with an underlying assumption that as the forest declines species diversity will decline similarly.[89] However, many such models have been proven to be wrong and loss of habitat does not necessarily lead to large scale loss of species.[89] Species-area models are known to overpredict the number of species known to be threatened in areas where actual deforestation is ongoing, and greatly overpredict the number of threatened species that are widespread.[87]

A recent study of the Brazilian Amazon predicts that despite a lack of extinctions thus far, up to 90 percent of predicted extinctions will finally occur in the next 40 years.[90]

Health effects

Public health context

Deforestation eliminates a great number of species of plants and animals which also often results in an increase in disease.[91] Deforestation can also create a path for non-native species to flourish such as certain types of snails, which have been correlated with an increase in schistosomiasis cases.[91][92]

Deforestation is occurring all over the world and has been coupled with an increase in the occurrence of disease outbreaks. In Malaysia, thousands of acres of forest have been cleared for pig farms. This has resulted in an increase in the zoonosis the Nipah virus.[93] In Kenya, deforestation has led to an increase in malaria cases which is now the leading cause of morbidity and mortality the country.[94][95] A 2017 study in the American Economic Review found that deforestation substantially increased the incidence of malaria in Nigeria.[96]

Another pathway through which deforestation affects disease is the relocation and dispersion of disease-carrying hosts. This disease emergence pathway can be called "range expansion", whereby the host's range (and thereby the range of pathogens) expands to new geographic areas.[97] Through deforestation, hosts and reservoir species are forced into neighboring habitats. Accompanying the reservoir species are pathogens that have the ability to find new hosts in previously unexposed regions. As these pathogens and species come into closer contact with humans, they are infected both directly and indirectly.

A catastrophic example of range expansion is the 1998 outbreak of Nipah virus in Malaysia.[98] For a number of years, deforestation, drought, and subsequent fires led to a dramatic geographic shift and density of fruit bats, a reservoir for Nipah virus.[99] Deforestation reduced the available fruiting trees in the bats' habitat, and they encroached on surrounding orchards which also happened to be the location of a large number of pigsties. The bats, through proximity spread the Nipah to pigs. While the virus infected the pigs, mortality was much lower than among humans, making the pigs a virulent host leading to the transmission of the virus to humans. This resulted in 265 reported cases of encephalitis, of which 105 resulted in death. This example provides an important lesson for the impact deforestation can have on human health.

Another example of range expansion due to deforestation and other anthropogenic habitat impacts includes the Capybara rodent in Paraguay.[100] This rodent is the host of a number of zoonotic diseases and, while there has not yet been a human-borne outbreak due to the movement of this rodent into new regions, it offers an example of how habitat destruction through deforestation and subsequent movements of species is occurring regularly.

A now well-developed theory is that the spread of HIV it is at least partially due deforestation. Rising populations created a food demand and with deforestation opening up new areas of the forest the hunters harvested a great deal of primate bushmeat, which is believed to be the origin of HIV.[91]

General Overview

According to the World Economic Forum, 31% of emerging diseases are linked to deforestation.[101]

According to the US Center for Disease Control and Prevention (CDC), 75% of emerging diseases in humans came from animals. The rising number of outbreaks is probably linked to habitat and biodiversity loss. In response, scientists created a new discipline: Planetary health, which says that the health of the ecosystems and the health of humans are linked.[102] In 2015, the Rockefeller Foundation and The Lancet launched the concept as the Rockefeller Foundation–Lancet Commission on Planetary Health.[103]

Since the 80's every decade the number of new diseases has increased more than 3 times. According to a major study by American and Australian scientists degradation of ecosystems increases the risk of new outbreaks. The diseases that passed to humans in this way in the latest decades include HIV, Ebola, Avian flu, Swine Flu, and likely the COVID-19 pandemic.[104]

In 2016 the United Nations Environment Programme published the: "UNEP Frontiers 2016 Report". In this report, the second chapter was dedicated to Zoonotic diseases, that is diseases that pass from animals to humans. This chapter stated that deforestation, climate change, and livestock agriculture are among the main causes that increase the risk of such diseases. It mentioned that every 4 months a new disease is discovered in humans. It is said that outbreaks that already happened (as of 2016) led to loss of lives and financial losses of billions dollars and if future diseases become pandemics it will cost trillions of dollars.[105]

The report presents the causes of the emerging diseases, large part of them environmental:

Cause	Part of emerging diseases caused by it (%)
Land-use change	31%
Agricultural industry changes	15%
International travel and commerce	13%
Medical industry changes	11%
War and Famine	7%
Climate and Weather	6%
Human demography and behavior	4%
Breakdown of public health	3%
Bushmeat	3%
Food industry change	2%
Other	4%[106]

On page 23 of the report are presented some of the latest emerging diseases and the definite environmental cause of them:

Disease	Environmental cause
Rabies	Forest activities in South America
Bat accosiated viruses	Deforestation and Agricultural expansion
Lyme disease	Forest fragmentation in North America
Nipah virus infection	Pig farming and intensification of fruit production in Malaysia
Japanese encephalitis virus	irrigated rice production and pig farming in Southeast Asia
Ebola virus disease	Forest losses
Avian influenza	Intensive Poultry farming
SARS virus	contact with civet cats either in the wild or in live animal markets[107]

HIV/AIDS

AIDS is probably linked to deforestation.[108] The virus firstly circulated among monkeys and when the humans came and destroyed the forest and most of the primates, the virus needed a new host to survive and jumped to humans.[109] The virus, which killed more than 25 million people, is believed to have come from the consumption of bushmeat, namely that of primates, and most likely chimpanzees in the Congo[110][111][112]

Malaria

Malaria, which killed 405,000 people in 2018,[113] is probably linked to deforestation. When humans change dramatically the ecological system the diversity in mosquito species is reduced and: ""The species that survive and become dominant, for reasons that are not well understood, almost always transmit malaria better than the species that had been most abundant in the intact forests", write Eric Chivian and Aaron Bernstein, public health experts at Harvard Medical School, in their book How Our Health Depends on Biodiversity. "This has been observed essentially everywhere malaria occurs".

Some of the reasons for this connection, found by scientists in the latest years:

When there is less shadow of the trees, the temperature of the water is higher which benefits mosquitos.
When the trees don't consume water, there is more water on the ground, which also benefits mosquitos.
Low lying vegetation is better for the species of mosquitos that transmit the disease.
When there is no forest there is less tanin in water. Than the water is less acidic and more turbid, what is better for some species of mosquitos.
The mosquitos that live in deforested areas are better at carrying malaria.
Another reason is that when a large part of a forest is destroyed, the animals are crowded in the remaining fragments in higher density, which facilitate the spread of the virus between them. This leads to a bigger number of cases between animals which increase the likelihood of transmission to humans.

Consequently, the same type of mosquito bites 278 times more often in deforested areas. According to one study in Brazil, cutting of 4% of the forest, leaded to a 50% increase in Malaria cases. In one region in Peru the number of cases per year, jumped from 600 to 120,000 after people begun to cut forests.[110]

Coronavirus disease 2019

According to the United Nations, World Health Organization and World Wildlife Foundation the Coronavirus pandemic is linked to the destruction of nature, especially to deforestation, habitat loss in general and wildlife trade[114].

In April 2020 United Nations Environment Programme published 2 short videos explaining the link between nature destruction, wildlife trade and the COVID-19 pandemic[115][116] and created a section on its site dedicated to the issue.[117]

The World Economic Forum published a call to involve nature recovery in the recovery efforts from the COVID-19 pandemic saying that this outbreak is linked to the destruction of the natural world.[118]

In May 2020 a group of experts from the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services published an article saying that humans are the species responsible for the COVID-19 pandemic because it is linked to nature destruction and more severe epidemics might occur if humanity will not change direction. It calls to "strengthen environmental regulations; adopt a 'One Health' approach to decision-making that recognizes complex interconnections among the health of people, animals, plants, and our shared environment; and prop up health care systems in the most vulnerable countries where resources are strained and underfunded", which can prevent future epidemics and therefore is in the interest of all. The call was published on the site of the World Economic Forum.[119]

According to the United Nations Environment Programme the Coronavirus disease 2019 is zoonotic, e.g., the virus passed from animals to humans. Such diseases are occurring more frequently in the latest decades, due to a number of factors, a large part of them environmental. One of the factors is deforestation because it reduce the space reserved for animals and destroys natural barriers between animals and humans. Another cause is climate change. Too fast changes in temperature and humidity facilitate the spread of diseases. The United Nations Environment Programme concludes that: "The most fundamental way to protect ourselves from zoonotic diseases is to prevent destruction of nature. Where ecosystems are healthy and biodiverse, they are resilient, adaptable and help to regulate diseases.[120]

In June 2020 a scientific unit of Greenpeace with University of the West of England (UWE) published a report saying that the rise of zoonotic diseases, including coronavirus is directly linked to deforestation because it change the interaction between people and animals and reduce the amount of water necessary for hygiene and diseases treatment.[121][122]

Experts say that anthropogenic deforestation, habitat loss and destruction of biodiversity may be linked to outbreaks like the COVID-19 pandemic in several ways:

Bringing people and domestic animals in contact with a species of animals and plants that did not contacted by them before. Kate Jones, chair of ecology and biodiversity at University College London, says the disruption of pristine forests, driven by logging, mining, road building through remote places, rapid urbanisation and population growth is bringing people into closer contact with animal species they may never have been near before, resulting in transmission of new zoonotic diseases from wildlife to humans.
Creating degraded habitats. Such habitats with a few species are more likely to cause a transmission of zoonotic viruses to humans.
Creating more crowded habitats, with more dense population.
Habitat loss prompts animals to search for a new one, which often results in mixing with humans and other animals.
Disruption of ecosystems can increase the number of animals that carry many viruses, like bats and rodents. It can increase the number of mice and rats by reducing the populations of predators. Deforestation in the Amazon rainforest increase the likelihood of malaria because the deforested area is ideal for mosquitoes.[118]
Animal trade, by killing and transporting live and dead animals very long distances. According to American science journalist David Quammen, "We cut the trees; we kill the animals or cage them and send them to markets. We disrupt ecosystems, and we shake viruses loose from their natural hosts. When that happens, they need a new host. Often, we are it."[102][104]

When climate change or deforestation causes a virus to pass to another host it became more dangerous. This is because viruses generally learn to coexist with their host and became virulent when they pass to another.[123]

Economic impact

A satellite image showing deforestation for a palm oil plantation in Malaysia

According to the World Economic Forum, half of the global GDP is strongly or moderately dependent on nature. For every dollar spent on Nature restoration there is a profit of at least 9 dollars. Example of this link is the COVID-19 pandemic, which is linked to nature destruction and caused severe economic damage.[124]

Damage to forests and other aspects of nature could halve living standards for the world's poor and reduce global GDP by about 7% by 2050, a report concluded at the Convention on Biological Diversity (CBD) meeting in Bonn in 2008.[125] Historically, utilization of forest products, including timber and fuel wood, has played a key role in human societies, comparable to the roles of water and cultivable land. Today, developed countries continue to utilize timber for building houses, and wood pulp for paper. In developing countries, almost three billion people rely on wood for heating and cooking.[126]

The forest products industry is a large part of the economy in both developed and developing countries. Short-term economic gains made by conversion of forest to agriculture, or over-exploitation of wood products, typically leads to a loss of long-term income and long-term biological productivity. West Africa, Madagascar, Southeast Asia and many other regions have experienced lower revenue because of declining timber harvests. Illegal logging causes billions of dollars of losses to national economies annually.[127]

The new procedures to get amounts of wood are causing more harm to the economy and overpower the amount of money spent by people employed in logging.[128] According to a study, "in most areas studied, the various ventures that prompted deforestation rarely generated more than US$5 for every ton of carbon they released and frequently returned far less than US$1". The price on the European market for an offset tied to a one-ton reduction in carbon is 23 euro (about US$35).[129]

Rapidly growing economies also have an effect on deforestation. Most pressure will come from the world's developing countries, which have the fastest-growing populations and most rapid economic (industrial) growth.[130] In 1995, economic growth in developing countries reached nearly 6%, compared with the 2% growth rate for developed countries.[130] As our human population grows, new homes, communities, and expansions of cities will occur. Connecting all of the new expansions will be roads, a very important part in our daily life. Rural roads promote economic development but also facilitate deforestation.[130] About 90% of the deforestation has occurred within 100 km of roads in most parts of the Amazon.[131]

The European Union is one of the largest importer of products made from illegal deforestation.[132]

Forest transition theory

The forest transition and historical baselines.[133]

The forest area change may follow a pattern suggested by the forest transition (FT) theory,[134] whereby at early stages in its development a country is characterized by high forest cover and low deforestation rates (HFLD countries).[40]

Then deforestation rates accelerate (HFHD, high forest cover – high deforestation rate), and forest cover is reduced (LFHD, low forest cover – high deforestation rate), before the deforestation rate slows (LFLD, low forest cover – low deforestation rate), after which forest cover stabilizes and eventually starts recovering. FT is not a "law of nature", and the pattern is influenced by national context (for example, human population density, stage of development, structure of the economy), global economic forces, and government policies. A country may reach very low levels of forest cover before it stabilizes, or it might through good policies be able to "bridge" the forest transition.[135]

FT depicts a broad trend, and an extrapolation of historical rates therefore tends to underestimate future BAU deforestation for counties at the early stages in the transition (HFLD), while it tends to overestimate BAU deforestation for countries at the later stages (LFHD and LFLD).

Countries with high forest cover can be expected to be at early stages of the FT. GDP per capita captures the stage in a country's economic development, which is linked to the pattern of natural resource use, including forests. The choice of forest cover and GDP per capita also fits well with the two key scenarios in the FT:

(i) a forest scarcity path, where forest scarcity triggers forces (for example, higher prices of forest products) that lead to forest cover stabilization; and

(ii) an economic development path, where new and better off-farm employment opportunities associated with economic growth (= increasing GDP per capita) reduce the profitability of frontier agriculture and slows deforestation.[40]

Historical causes

Prehistory

The Carboniferous Rainforest Collapse[9] was an event that occurred 300 million years ago. Climate change devastated tropical rainforests causing the extinction of many plant and animal species. The change was abrupt, specifically, at this time climate became cooler and drier, conditions that are not favorable to the growth of rainforests and much of the biodiversity within them. Rainforests were fragmented forming shrinking 'islands' further and further apart. Populations such as the sub class Lissamphibia were devastated, whereas Reptilia survived the collapse. The surviving organisms were better adapted to the drier environment left behind and served as legacies in succession after the collapse.[136]

An array of Neolithic artifacts, including bracelets, ax heads, chisels, and polishing tools.

Rainforests once covered 14% of the earth's land surface; now they cover a mere 6% and experts estimate that the last remaining rainforests could be consumed in less than 40 years.[137] Small scale deforestation was practiced by some societies for tens of thousands of years before the beginnings of civilization.[138] The first evidence of deforestation appears in the Mesolithic period.[139] It was probably used to convert closed forests into more open ecosystems favourable to game animals.[138] With the advent of agriculture, larger areas began to be deforested, and fire became the prime tool to clear land for crops. In Europe there is little solid evidence before 7000 BC. Mesolithic foragers used fire to create openings for red deer and wild boar. In Great Britain, shade-tolerant species such as oak and ash are replaced in the pollen record by hazels, brambles, grasses and nettles. Removal of the forests led to decreased transpiration, resulting in the formation of upland peat bogs. Widespread decrease in elm pollen across Europe between 8400–8300 BC and 7200–7000 BC, starting in southern Europe and gradually moving north to Great Britain, may represent land clearing by fire at the onset of Neolithic agriculture.

The Neolithic period saw extensive deforestation for farming land.[140][141] Stone axes were being made from about 3000 BC not just from flint, but from a wide variety of hard rocks from across Britain and North America as well. They include the noted Langdale axe industry in the English Lake District, quarries developed at Penmaenmawr in North Wales and numerous other locations. Rough-outs were made locally near the quarries, and some were polished locally to give a fine finish. This step not only increased the mechanical strength of the axe, but also made penetration of wood easier. Flint was still used from sources such as Grimes Graves but from many other mines across Europe.

Evidence of deforestation has been found in Minoan Crete; for example the environs of the Palace of Knossos were severely deforested in the Bronze Age.[142]

Pre-industrial history

Easter Island, deforested. According to Jared Diamond: "Among past societies faced with the prospect of ruinous deforestation, Easter Island and Mangareva chiefs succumbed to their immediate concerns, but Tokugawa shoguns, Inca emperors, New Guinea highlanders, and 16th century German landowners adopted a long view and reafforested."[143]

Throughout prehistory, humans were hunter gatherers who hunted within forests. In most areas, such as the Amazon, the tropics, Central America, and the Caribbean,[144] only after shortages of wood and other forest products occur are policies implemented to ensure forest resources are used in a sustainable manner.

Three regional studies of historic erosion and alluviation in ancient Greece found that, wherever adequate evidence exists, a major phase of erosion follows the introduction of farming in the various regions of Greece by about 500–1,000 years, ranging from the later Neolithic to the Early Bronze Age.[145] The thousand years following the mid-first millennium BC saw serious, intermittent pulses of soil erosion in numerous places. The historic silting of ports along the southern coasts of Asia Minor (e.g. Clarus, and the examples of Ephesus, Priene and Miletus, where harbors had to be abandoned because of the silt deposited by the Meander) and in coastal Syria during the last centuries BC.

Easter Island has suffered from heavy soil erosion in recent centuries, aggravated by agriculture and deforestation.[146] Jared Diamond gives an extensive look into the collapse of the ancient Easter Islanders in his book Collapse. The disappearance of the island's trees seems to coincide with a decline of its civilization around the 17th and 18th century. He attributed the collapse to deforestation and over-exploitation of all resources.[147][148]

The famous silting up of the harbor for Bruges, which moved port commerce to Antwerp, also followed a period of increased settlement growth (and apparently of deforestation) in the upper river basins. In early medieval Riez in upper Provence, alluvial silt from two small rivers raised the riverbeds and widened the floodplain, which slowly buried the Roman settlement in alluvium and gradually moved new construction to higher ground; concurrently the headwater valleys above Riez were being opened to pasturage.[149]

A typical progress trap was that cities were often built in a forested area, which would provide wood for some industry (for example, construction, shipbuilding, pottery). When deforestation occurs without proper replanting, however; local wood supplies become difficult to obtain near enough to remain competitive, leading to the city's abandonment, as happened repeatedly in Ancient Asia Minor. Because of fuel needs, mining and metallurgy often led to deforestation and city abandonment.[150]

With most of the population remaining active in (or indirectly dependent on) the agricultural sector, the main pressure in most areas remained land clearing for crop and cattle farming. Enough wild green was usually left standing (and partially used, for example, to collect firewood, timber and fruits, or to graze pigs) for wildlife to remain viable. The elite's (nobility and higher clergy) protection of their own hunting privileges and game often protected significant woodland.[135]

Major parts in the spread (and thus more durable growth) of the population were played by monastical 'pioneering' (especially by the Benedictine and Commercial orders) and some feudal lords' recruiting farmers to settle (and become tax payers) by offering relatively good legal and fiscal conditions. Even when speculators sought to encourage towns, settlers needed an agricultural belt around or sometimes within defensive walls. When populations were quickly decreased by causes such as the Black Death, the colonization of the Americas,[151] or devastating warfare (for example, Genghis Khan's Mongol hordes in eastern and central Europe, Thirty Years' War in Germany), this could lead to settlements being abandoned. The land was reclaimed by nature, but the secondary forests usually lacked the original biodiversity. The Mongol invasions and conquests alone resulted in the reduction of 700 million tons of carbon from the atmosphere by enabling the re-growth of carbon-absorbing forests on depopulated lands over a significant period of time.[152]

Deforestation of Brazil's Atlantic Forest c.1820–1825

From 1100 to 1500 AD, significant deforestation took place in Western Europe as a result of the expanding human population. The large-scale building of wooden sailing ships by European (coastal) naval owners since the 15th century for exploration, colonisation, slave trade, and other trade on the high seas, consumed many forest resources and became responsible for the introduction of numerous bubonic plague outbreaks in the 14th century. Piracy also contributed to the over harvesting of forests, as in Spain. This led to a weakening of the domestic economy after Columbus' discovery of America, as the economy became dependent on colonial activities (plundering, mining, cattle, plantations, trade, etc.)[153]

In Changes in the Land (1983), William Cronon analyzed and documented 17th-century English colonists' reports of increased seasonal flooding in New England during the period when new settlers initially cleared the forests for agriculture. They believed flooding was linked to widespread forest clearing upstream.

The massive use of charcoal on an industrial scale in Early Modern Europe was a new type of consumption of western forests; even in Stuart England, the relatively primitive production of charcoal has already reached an impressive level. Stuart England was so widely deforested that it depended on the Baltic trade for ship timbers, and looked to the untapped forests of New England to supply the need. Each of Nelson's Royal Navy war ships at Trafalgar (1805) required 6,000 mature oaks for its construction. In France, Colbert planted oak forests to supply the French navy in the future. When the oak plantations matured in the mid-19th century, the masts were no longer required because shipping had changed.

Norman F. Cantor's summary of the effects of late medieval deforestation applies equally well to Early Modern Europe:[154]

Europeans had lived in the midst of vast forests throughout the earlier medieval centuries. After 1250 they became so skilled at deforestation that by 1500 they were running short of wood for heating and cooking. They were faced with a nutritional decline because of the elimination of the generous supply of wild game that had inhabited the now-disappearing forests, which throughout medieval times had provided the staple of their carnivorous high-protein diet. By 1500 Europe was on the edge of a fuel and nutritional disaster [from] which it was saved in the sixteenth century only by the burning of soft coal and the cultivation of potatoes and maize.

Industrial era

In the 19th century, introduction of steamboats in the United States was the cause of deforestation of banks of major rivers, such as the Mississippi River, with increased and more severe flooding one of the environmental results. The steamboat crews cut wood every day from the riverbanks to fuel the steam engines. Between St. Louis and the confluence with the Ohio River to the south, the Mississippi became more wide and shallow, and changed its channel laterally. Attempts to improve navigation by the use of snag pullers often resulted in crews' clearing large trees 100 to 200 feet (61 m) back from the banks. Several French colonial towns of the Illinois Country, such as Kaskaskia, Cahokia and St. Philippe, Illinois, were flooded and abandoned in the late 19th century, with a loss to the cultural record of their archeology.[155]

The wholescale clearance of woodland to create agricultural land can be seen in many parts of the world, such as the Central forest-grasslands transition and other areas of the Great Plains of the United States. Specific parallels are seen in the 20th-century deforestation occurring in many developing nations.

Rates of deforestation

Slash-and-burn farming in the state of Rondônia, western Brazil

Estimates vary widely as to the extent of tropical deforestation.[156][157]

Present-day

In 2019, the world lost nearly 12 million hectares of tree cover. Nearly a third of that loss, 3.8 million hectares, occurred within humid tropical primary forests, areas of mature rainforest that are especially important for biodiversity and carbon storage. That’s the equivalent of losing an area of primary forest the size of a football pitch every six seconds.[158][159]

History

Global deforestation[160] sharply accelerated around 1852.[161][162] As of 1947, the planet had 15 million to 16 million km² (5.8 million to 6.2 million sq mi) of mature tropical forests,[163] but by 2015, it was estimated that about half of these had been destroyed.[164][11][165] Total land coverage by tropical rainforests decreased from 14% to 6%. Much of this loss happened between 1960 and 1990, when 20% of all tropical rainforests were destroyed. At this rate, extinction of such forests is projected to occur by the mid-21st century.[136]

In the early 2000s, some scientists predicted that unless significant measures (such as seeking out and protecting old growth forests that have not been disturbed)[163] are taken on a worldwide basis, by 2030 there will only be 10% remaining,[161][165] with another 10% in a degraded condition.[161] 80% will have been lost, and with them hundreds of thousands of irreplaceable species.[161]

Rates of change

A 2002 analysis of satellite imagery suggested that the rate of deforestation in the humid tropics (approximately 5.8 million hectares per year) was roughly 23% lower than the most commonly quoted rates.[166] A 2005 report by the United Nations Food and Agriculture Organization (FAO) estimated that although the Earth's total forest area continued to decrease at about 13 million hectares per year, the global rate of deforestation had been slowing.[167][168] On the other hand, a 2005 analysis of satellite images reveals that deforestation of the Amazon rainforest is twice as fast as scientists previously estimated.[169][170]

From 2010 to 2015, worldwide forest area decreased by 3.3 million ha per year, according to the FAO. During this five-year period, the biggest forest area loss occurred in the tropics, particularly in South America and Africa. Per capita forest area decline was also greatest in the tropics and subtropics but is occurring in every climatic domain (except in the temperate) as populations increase.[171]

Some claim that rainforests are being destroyed at an ever-quickening pace.[172] The London-based Rainforest Foundation notes that "the UN figure is based on a definition of forest as being an area with as little as 10% actual tree cover, which would therefore include areas that are actually savanna-like ecosystems and badly damaged forests".[173] Other critics of the FAO data point out that they do not distinguish between forest types,[174] and that they are based largely on reporting from forestry departments of individual countries,[175] which do not take into account unofficial activities like illegal logging.[176] Despite these uncertainties, there is agreement that destruction of rainforests remains a significant environmental problem.

Methods of analysis

Some have argued that deforestation trends may follow a Kuznets curve,[177] which if true would nonetheless fail to eliminate the risk of irreversible loss of non-economic forest values (for example, the extinction of species).[178][179]

Some cartographers have attempted to illustrate the sheer scale of deforestation by country using a cartogram.[180]

Satellite image of Haiti's border with the Dominican Republic (right) shows the amount of deforestation on the Haitian side

Deforestation around Pakke Tiger Reserve, India

Regions

Rates of deforestation vary around the world.

Up to 90% of West Africa's coastal rainforests have disappeared since 1900.[181] Madagascar has lost 90% of its eastern rainforests.[182][183]

In South Asia, about 88% of the rainforests have been lost.[184]

Mexico, India, the Philippines, Indonesia, Thailand, Burma, Malaysia, Bangladesh, China, Sri Lanka, Laos, Nigeria, the Democratic Republic of the Congo, Liberia, Guinea, Ghana and the Ivory Coast, have lost large areas of their rainforest.[185][186]

Much of what remains of the world's rainforests is in the Amazon basin, where the Amazon Rainforest covers approximately 4 million square kilometres.[187] Some 80% of the deforestation of the Amazon can be attributed to cattle ranching,[188] as Brazil is the largest exporter of beef in the world.[189] The Amazon region has become one of the largest cattle ranching territories in the world.[190] The regions with the highest tropical deforestation rate between 2000 and 2005 were Central America—which lost 1.3% of its forests each year—and tropical Asia.[173] In Central America, two-thirds of lowland tropical forests have been turned into pasture since 1950 and 40% of all the rainforests have been lost in the last 40 years.[191] Brazil has lost 90–95% of its Mata Atlântica forest.[192] Deforestation in Brazil increased by 88% for the month of June 2019, as compared with the previous year.[193] However, Brazil still destroyed 1.3 million hectares in 2019.[158] Brazil is one of several countries that have declared their deforestation a national emergency.[194][195] Paraguay was losing its natural semi humid forests in the country's western regions at a rate of 15.000 hectares at a randomly studied 2-month period in 2010,[196] Paraguay's parliament refused in 2009 to pass a law that would have stopped cutting of natural forests altogether.[197]

As of 2007, less than 50% of Haiti's forests remained.[198]

The World Wildlife Fund's ecoregion project catalogues habitat types throughout the world, including habitat loss such as deforestation, showing for example that even in the rich forests of parts of Canada such as the Mid-Continental Canadian forests of the prairie provinces half of the forest cover has been lost or altered.

In 2011 Conservation International listed the top 10 most endangered forests, characterized by having all lost 90% or more of their original habitat, and each harboring at least 1500 endemic plant species (species found nowhere else in the world).[199]

**Top 10 Most Endangered Forests 2011**
Endangered forest	Region	Remaining habitat	Predominate vegetation type	Notes
Indo-Burma	Asia-Pacific	5%	Tropical and subtropical moist broadleaf forests	Rivers, floodplain wetlands, mangrove forests. Burma, Thailand, Laos, Vietnam, Cambodia, India.[200]
New Caledonia	Asia-Pacific	5%	Tropical and subtropical moist broadleaf forests	See note for region covered.[201]
Sundaland	Asia-Pacific	7%	Tropical and subtropical moist broadleaf forests	Western half of the Indo-Malayan archipelago including southern Borneo and Sumatra.[202]
Philippines	Asia-Pacific	7%	Tropical and subtropical moist broadleaf forests	Forests over the entire country including 7,100 islands.[203]
Atlantic Forest	South America	8%	Tropical and subtropical moist broadleaf forests	Forests along Brazil's Atlantic coast, extends to parts of Paraguay, Argentina and Uruguay.[204]
Mountains of Southwest China	Asia-Pacific	8%	Temperate coniferous forest	See note for region covered.[205]
California Floristic Province	North America	10%	Tropical and subtropical dry broadleaf forests	See note for region covered.[206]
Coastal Forests of Eastern Africa	Africa	10%	Tropical and subtropical moist broadleaf forests	Mozambique, Tanzania, Kenya, Somalia.[207]
Madagascar & Indian Ocean Islands	Africa	10%	Tropical and subtropical moist broadleaf forests	Madagascar, Mauritius, Reunion, Seychelles, Comoros.[208]
Eastern Afromontane	Africa	11%	Tropical and subtropical moist broadleaf forests Montane grasslands and shrublands	Forests scattered along the eastern edge of Africa, from Saudi Arabia in the north to Zimbabwe in the south.[209]

Table source:[199]

Control

Reducing emissions

Main international organizations including the United Nations and the World Bank, have begun to develop programs aimed at curbing deforestation. The blanket term Reducing Emissions from Deforestation and Forest Degradation (REDD) describes these sorts of programs, which use direct monetary or other incentives to encourage developing countries to limit and/or roll back deforestation. Funding has been an issue, but at the UN Framework Convention on Climate Change (UNFCCC) Conference of the Parties-15 (COP-15) in Copenhagen in December 2009, an accord was reached with a collective commitment by developed countries for new and additional resources, including forestry and investments through international institutions, that will approach US$30 billion for the period 2010–2012.[210] Significant work is underway on tools for use in monitoring developing country adherence to their agreed REDD targets. These tools, which rely on remote forest monitoring using satellite imagery and other data sources, include the Center for Global Development's FORMA (Forest Monitoring for Action) initiative[211] and the Group on Earth Observations' Forest Carbon Tracking Portal.[212] Methodological guidance for forest monitoring was also emphasized at COP-15.[213] The environmental organization Avoided Deforestation Partners leads the campaign for development of REDD through funding from the U.S. government.[214] In 2014, the Food and Agriculture Organization of the United Nations and partners launched Open Foris – a set of open-source software tools that assist countries in gathering, producing and disseminating information on the state of forest resources.[215] The tools support the inventory lifecycle, from needs assessment, design, planning, field data collection and management, estimation analysis, and dissemination. Remote sensing image processing tools are included, as well as tools for international reporting for Reducing emissions from deforestation and forest degradation (REDD) and MRV (Measurement, Reporting and Verification)[216] and FAO's Global Forest Resource Assessments.

In evaluating implications of overall emissions reductions, countries of greatest concern are those categorized as High Forest Cover with High Rates of Deforestation (HFHD) and Low Forest Cover with High Rates of Deforestation (LFHD). Afghanistan, Benin, Botswana, Burma, Burundi, Cameroon, Chad, Ecuador, El Salvador, Ethiopia, Ghana, Guatemala, Guinea, Haiti, Honduras, Indonesia, Liberia, Malawi, Mali, Mauritania, Mongolia, Namibia, Nepal, Nicaragua, Niger, Nigeria, Pakistan, Paraguay, Philippines, Senegal, Sierra Leone, Sri Lanka, Sudan, Togo, Uganda, United Republic of Tanzania, Zimbabwe are listed as having Low Forest Cover with High Rates of Deforestation (LFHD). Brazil, Cambodia, Democratic People's Republic of Korea, Equatorial Guinea, Malaysia, Solomon Islands, Timor-Leste, Venezuela, Zambia are listed as High Forest Cover with High Rates of Deforestation (HFHD).[217]

Control can be made by the companies. In 2018 the biggest palm oil trader, Wilmar, decided to control his suppliers for avoid deforestation. This is an important precedent[218]

Payments for conserving forests

In Bolivia, deforestation in upper river basins has caused environmental problems, including soil erosion and declining water quality. An innovative project to try and remedy this situation involves landholders in upstream areas being paid by downstream water users to conserve forests. The landholders receive US$20 to conserve the trees, avoid polluting livestock practices, and enhance the biodiversity and forest carbon on their land. They also receive US$30, which purchases a beehive, to compensate for conservation for two hectares of water-sustaining forest for five years. Honey revenue per hectare of forest is US$5 per year, so within five years, the landholder has sold US$50 of honey.[219] The project is being conducted by Fundación Natura Bolivia and Rare Conservation, with support from the Climate & Development Knowledge Network.

Land rights

Transferring land rights to indigenous inhabitants is argued to efficiently conserve forests.

Transferring rights over land from public domain to its indigenous inhabitants is argued to be a cost-effective strategy to conserve forests.[220] This includes the protection of such rights entitled in existing laws, such as India's Forest Rights Act.[220] The transferring of such rights in China, perhaps the largest land reform in modern times, has been argued to have increased forest cover.[221] In Brazil, forested areas given tenure to indigenous groups have even lower rates of clearing than national parks.[221]

Farming

New methods are being developed to farm more intensively, such as high-yield hybrid crops, greenhouse, autonomous building gardens, and hydroponics. These methods are often dependent on chemical inputs to maintain necessary yields. In cyclic agriculture, cattle are grazed on farm land that is resting and rejuvenating. Cyclic agriculture actually increases the fertility of the soil. Intensive farming can also decrease soil nutrients by consuming at an accelerated rate the trace minerals needed for crop growth.[136] The most promising approach, however, is the concept of food forests in permaculture, which consists of agroforestal systems carefully designed to mimic natural forests, with an emphasis on plant and animal species of interest for food, timber and other uses. These systems have low dependence on fossil fuels and agro-chemicals, are highly self-maintaining, highly productive, and with strong positive impact on soil and water quality, and biodiversity.

Monitoring deforestation

Agents from IBAMA, Brazil's environmental police, searching for illegal logging activity in Indigenous territory in the Amazon rainforest, 2018

There are multiple methods that are appropriate and reliable for reducing and monitoring deforestation. One method is the "visual interpretation of aerial photos or satellite imagery that is labor-intensive but does not require high-level training in computer image processing or extensive computational resources".[131] Another method includes hot-spot analysis (that is, locations of rapid change) using expert opinion or coarse resolution satellite data to identify locations for detailed digital analysis with high resolution satellite images.[131] Deforestation is typically assessed by quantifying the amount of area deforested, measured at the present time. From an environmental point of view, quantifying the damage and its possible consequences is a more important task, while conservation efforts are more focused on forested land protection and development of land-use alternatives to avoid continued deforestation.[131] Deforestation rate and total area deforested, have been widely used for monitoring deforestation in many regions, including the Brazilian Amazon deforestation monitoring by INPE.[60] A global satellite view is available.[222][223]

Forest management

Efforts to stop or slow deforestation have been attempted for many centuries because it has long been known that deforestation can cause environmental damage sufficient in some cases to cause societies to collapse. In Tonga, paramount rulers developed policies designed to prevent conflicts between short-term gains from converting forest to farmland and long-term problems forest loss would cause,[224] while during the 17th and 18th centuries in Tokugawa, Japan,[225] the shōguns developed a highly sophisticated system of long-term planning to stop and even reverse deforestation of the preceding centuries through substituting timber by other products and more efficient use of land that had been farmed for many centuries. In 16th-century Germany, landowners also developed silviculture to deal with the problem of deforestation. However, these policies tend to be limited to environments with good rainfall, no dry season and very young soils (through volcanism or glaciation). This is because on older and less fertile soils trees grow too slowly for silviculture to be economic, whilst in areas with a strong dry season there is always a risk of forest fires destroying a tree crop before it matures.

In the areas where "slash-and-burn" is practiced, switching to "slash-and-char" would prevent the rapid deforestation and subsequent degradation of soils. The biochar thus created, given back to the soil, is not only a durable carbon sequestration method, but it also is an extremely beneficial amendment to the soil. Mixed with biomass it brings the creation of terra preta, one of the richest soils on the planet and the only one known to regenerate itself.

Sustainable practices

Bamboo is advocated as a more sustainable alternative for cutting down wood for fuel.[226]

Certification, as provided by global certification systems such as Programme for the Endorsement of Forest Certification and Forest Stewardship Council, contributes to tackling deforestation by creating market demand for timber from sustainably managed forests. According to the United Nations Food and Agriculture Organization (FAO), "A major condition for the adoption of sustainable forest management is a demand for products that are produced sustainably and consumer willingness to pay for the higher costs entailed. Certification represents a shift from regulatory approaches to market incentives to promote sustainable forest management. By promoting the positive attributes of forest products from sustainably managed forests, certification focuses on the demand side of environmental conservation."[227] Rainforest Rescue argues that the standards of organizations like FSC are too closely connected to timber industry interests and therefore do not guarantee environmentally and socially responsible forest management. In reality, monitoring systems are inadequate and various cases of fraud have been documented worldwide.[228]

Some nations have taken steps to help increase the number of trees on Earth. In 1981, China created National Tree Planting Day Forest and forest coverage had now reached 16.55% of China's land mass, as against only 12% two decades ago.[229]

Using fuel from bamboo rather than wood results in cleaner burning, and since bamboo matures much faster than wood, deforestation is reduced as supply can be replenished faster.[226]

Reforestation

In many parts of the world, especially in East Asian countries, reforestation and afforestation are increasing the area of forested lands.[230] The amount of woodland has increased in 22 of the world's 50 most forested nations. Asia as a whole gained 1 million hectares of forest between 2000 and 2005. Tropical forest in El Salvador expanded more than 20% between 1992 and 2001. Based on these trends, one study projects that global forestation will increase by 10%—an area the size of India—by 2050.[231]

In the People's Republic of China, where large scale destruction of forests has occurred, the government has in the past required that every able-bodied citizen between the ages of 11 and 60 plant three to five trees per year or do the equivalent amount of work in other forest services. The government claims that at least 1 billion trees have been planted in China every year since 1982. This is no longer required today, but 12 March of every year in China is the Planting Holiday. Also, it has introduced the Green Wall of China project, which aims to halt the expansion of the Gobi desert through the planting of trees. However, due to the large percentage of trees dying off after planting (up to 75%), the project is not very successful. There has been a 47-million-hectare increase in forest area in China since the 1970s.[231] The total number of trees amounted to be about 35 billion and 4.55% of China's land mass increased in forest coverage. The forest coverage was 12% two decades ago and now is 16.55%.[229]

An ambitious proposal for China is the Aerially Delivered Re-forestation and Erosion Control System and the proposed Sahara Forest Project coupled with the Seawater Greenhouse.

In Western countries, increasing consumer demand for wood products that have been produced and harvested in a sustainable manner is causing forest landowners and forest industries to become increasingly accountable for their forest management and timber harvesting practices.

The Arbor Day Foundation's Rain Forest Rescue program is a charity that helps to prevent deforestation. The charity uses donated money to buy up and preserve rainforest land before the lumber companies can buy it. The Arbor Day Foundation then protects the land from deforestation. This also locks in the way of life of the primitive tribes living on the forest land. Organizations such as Community Forestry International, Cool Earth, The Nature Conservancy, World Wide Fund for Nature, Conservation International, African Conservation Foundation and Greenpeace also focus on preserving forest habitats. Greenpeace in particular has also mapped out the forests that are still intact[232] and published this information on the internet.[233] World Resources Institute in turn has made a simpler thematic map[234] showing the amount of forests present just before the age of man (8000 years ago) and the current (reduced) levels of forest.[235] These maps mark the amount of afforestation required to repair the damage caused by people.

Forest plantations

In order to acquire the world's demand for wood, it is suggested that high yielding forest plantations are suitable according to forest writers Botkins and Sedjo. Plantations that yield 10 cubic meters per hectare a year would supply enough wood for trading of 5% of the world's existing forestland. By contrast, natural forests produce about 1–2 cubic meters per hectare; therefore, 5–10 times more forestland would be required to meet demand. Forester Chad Oliver has suggested a forest mosaic with high-yield forest lands interspersed with conservation land.[236]

Globally, planted forests increased from 4.1% to 7.0% of the total forest area between 1990 and 2015.[237] Plantation forests made up 280 million ha in 2015, an increase of about 40 million ha in the last ten years.[238] Globally, planted forests consist of about 18% exotic or introduced species while the rest are species native to the country where they are planted. In South America, Oceania, and East and Southern Africa, planted forests are dominated by introduced species: 88%, 75% and 65%, respectively. In North America, West and Central Asia, and Europe the proportions of introduced species in plantations are much lower at 1%, 3% and 8% of the total area planted, respectively.[237]

In the country of Senegal, on the western coast of Africa, a movement headed by youths has helped to plant over 6 million mangrove trees. The trees will protect local villages from storm damages and will provide a habitat for local wildlife. The project started in 2008, and already the Senegalese government has been asked to establish rules and regulations that would protect the new mangrove forests.[239]

Military context

U.S. Army Huey helicopter spraying Agent Orange during the Vietnam War

While demands for agricultural and urban use for the human population cause the preponderance of deforestation, military causes can also intrude. One example of deliberate deforestation played out in the U.S. zone of occupation in Germany after World War II ended in 1945. Before the onset of the Cold War, defeated Germany was still considered a potential future threat rather than a potential future ally. To address this threat, the victorious Allies made attempts to lower German industrial potential, of which forests were deemed an element. Sources in the U.S. government admitted that the purpose of this was that the "ultimate destruction of the war potential of German forests". As a consequence of the practice of clear-felling, deforestation resulted which could "be replaced only by long forestry development over perhaps a century".[240]

Operations in war can also cause deforestation. For example, in the 1945 Battle of Okinawa, bombardment and other combat operations reduced a lush tropical landscape into "a vast field of mud, lead, decay and maggots".[241]

Deforestation can also result from the intentional tactics of military forces. Clearing forest became an element in the Russian Empire's successful conquest of the Caucasus in the mid-19th century.[242] The British (during the Malayan Emergency) and the United States (in the Korean War[243] and in the Vietnam War) used defoliants (like Agent Orange or others).[244][245][246]

gollark: Many of the side channel effects date to before then.

gollark: If you want custom software support, you are buying from the wrong company.

gollark: It is rumored that they'll move to custom ARM chips in MacBooks anyway.

gollark: They'll just mess up the cooling to make it more shiny and aluminium.

gollark: Yes, they have become Apple in all their badness.

References

Notes

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General references

BBC 2005 TV series on the history of geological factors shaping human history (name?)
A Natural History of Europe – 2005 co-production including BBC and ZDF
Runyan, C.W., and D'Odorico, P. (2016) Global Deforestation, Cambridge University Press, New York.
Whitney, Gordon G. (1996). From Coastal Wilderness to Fruited Plain : A History of Environmental Change in Temperate North America from 1500 to the Present. Cambridge University Press. ISBN 0-521-57658-X
Williams, Michael. (2003). Deforesting the Earth. University of Chicago Press, Chicago. ISBN 0-226-89926-8
Wunder, Sven. (2000). The Economics of Deforestation: The Example of Ecuador. Macmillan Press, London. ISBN 0-333-73146-8
FAO&CIFOR report: Forests and Floods: Drowning in Fiction or Thriving on Facts?
Fenical, William (September 1983). "Marine Plants: A Unique and Unexplored Resource". Plants: the potentials for extracting protein, medicines, and other useful chemicals (workshop proceedings). DIANE Publishing. p. 147. ISBN 1-4289-2397-7.

Ethiopia deforestation references

Parry, J. (2003). Tree choppers become tree planters. Appropriate Technology, 30(4), 38–39. Retrieved 22 November 2006, from ABI/INFORM Global database. (Document ID: 538367341).
Hillstrom, K & Hillstrom, C. (2003). Africa and the Middle east. A continental Overview of Environmental Issues. Santabarbara, CA: ABC CLIO.
Williams, M. (2006). Deforesting the earth: From prehistory to global crisis: An Abridgment. Chicago: The university of Chicago Press.
Mccann, J.C. (1990). "A Great Agrarian cycle? Productivity in Highland Ethiopia, 1900 To 1987". Journal of Interdisciplinary History. xx: 3, 389–416.

External links

Global map of deforestation based on Landsat data
JICA-JAXA Forest Early Warning System in the Tropics: JJ-FAST (FOREST GOVERNANCE INITIATIVE)- JICA-JAXA
Old-growth forest zones within the remaining world forests
EIA forest reports: Investigations into illegal logging.
EIA in the USA Reports and info.
Cocaine destroys 4 m2 of rainforest per gram The Guardian
"Avoided Deforestation" Plan Gains Support – Worldwatch Institute
OneWorld Tropical Forests Guide
Some Background Info to Deforestation and REDD+
General info on deforestation effects
Deforestation and Climate Change

In the media

14 March 2007, Independent Online: Destruction of forests in developing world 'out of control'
Pappas, S. (14 November 2013). "Vanishing Forests: New Map Details Global Deforestation". LiveScience.com. TechMediaNetwork. Retrieved 16 November 2013.
31 August 2017, Independent Online: New Amazonian species discovered every two days while the rainforest is trashed by 'relentless deforestation'
2 July 2019, The Guardian: Revealed: rampant deforestation of Amazon driven by global greed for meat.

Films online

Watch the National Film Board of Canada documentaries Battle for the Trees & Forest in Crisis
Video on Illegal Deforestation In Paraguay

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

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Deforestation and desertification
Deforestation	Assarting Deforestation Deforestation and climate change Deforestation by region Deforestation during the Roman period Illegal logging Mountaintop removal Slash-and-burn Slash-and-char
Desertification	Aridification Desertification Moisture recycling Soil retrogression and degradation Water scarcity
Mitigation	Afforestation Arid Lands Information Network Biochar Conservation grazing Desert greening Ecoforestry Ecological engineering Farmer-managed regeneration Flexible Mechanisms Great Green Wall (Africa) Managed intensive rotational grazing Oasification Reforestation Three-North Shelter Forest (China)
Related articles	Allan Savory Biodiversity Economic impact analysis Environmental philosophy Extinction Intact forest landscape International Year of Forests Land surface effects on climate Land use, land-use change and forestry Natural landscape Neolithic Richard St. Barbe Baker Satoyama Terraforming Terra preta Wilderness World Forestry Congress

Deforestation by country or region
Africa	Angola DR Congo Ethiopia Kenya Madagascar Nigeria
Americas	Amazon Brazil Canada (British Columbia) Central America Colombia Costa Rica Haiti Mexico United States
Asia	Borneo Cambodia China India Indonesia (Kalimantan) Laos Malaysia (East Malaysia) Myanmar Nepal Philippines Sri Lanka Taiwan Thailand Vietnam
Europe	Roman Empire Russia
Oceania	Australia New Zealand Papua New Guinea
Category Commons WikiProject Forestry

Human impact on the environment
General	Environmental issues list of issues Human impact on marine life List of global issues Impact assessment Planetary boundaries
Causes	Agriculture irrigation meat production cocoa production palm oil Energy industry biofuels biodiesel coal nuclear power oil shale petroleum reservoirs Genetic pollution Industrialisation Land use Manufacturing cleaning agents concrete plastics nanotechnology paint paper pesticides pharmaceuticals and personal care Marine life fishing fishing down the food web marine pollution overfishing Mining Overdrafting Overexploitation Overgrazing Overpopulation Particulates Pollution Quarrying Reservoirs Tourism Transport aviation roads shipping Urbanization urban sprawl War
Effects	Biodiversity threats biodiversity loss decline in amphibian populations decline in insect populations Climate change global warming runaway climate change Coral reefs Deforestation Defaunation Desertification Ecocide Erosion Environmental degradation Freshwater cycle Habitat destruction Holocene extinction Nitrogen cycle Land degradation Land consumption Land surface effects on climate Loss of green belts Phosphorus cycle Ocean acidification Ozone depletion Resource depletion Water degradation Water scarcity
Mitigation	Alternative fuel vehicle propulsion Birth control Cleaner production Climate change mitigation Climate engineering Community resilience Decoupling Ecological engineering Environmental engineering Environmental mitigation Industrial ecology Mitigation banking Organic farming Recycling Reforestation urban Restoration ecology Sustainable consumption Waste minimization
Commons Category by country assessment mitigation