Earth:Deforestation and climate change

From HandWiki
Short description: Relationship between deforestation and global warming
Tropical deforestation – given as the annual average between 2010 and 2014 – was responsible for 2.6 billion tonnes of CO
2
per year. That was 6.5% of global CO
2
emission. International trade was responsible for around one-third (29%) of the emissions. Most emissions – 71% – came from foods consumed in the country that they were produced (domestic demand).

Deforestation is a primary contributor to climate change,[1][2] and climate change affects forests.[3] Land use changes, especially in the form of deforestation,[4] are the second largest anthropogenic source of atmospheric carbon dioxide emissions, after fossil fuel combustion.[5] Greenhouse gases are emitted during combustion of forest biomass and decomposition of remaining plant material and soil carbon. Global models and national greenhouse gas inventories give similar results for deforestation emissions.[4] (As of 2019), deforestation is responsible for about 11% of global greenhouse gas emissions.[6] Carbon emissions from tropical deforestation are accelerating.[7][8] Growing forests are a carbon sink with additional potential to mitigate the effects of climate change. Some of the effects of climate change, such as more wildfires,[9] insect outbreaks, invasive species, and storms are factors that increase deforestation.[10][11]

Forests cover 31% of the land area on Earth and annually 75,700 square kilometers (18.7 million acres) of the forest is lost.[12] According to the World Resources Institute, there was a 12% increase in the loss of primary tropical forests from 2019 to 2020.[13]

Deforestation is often described as the changing of land from forested to non-forested by means both natural and unnatural. The relationship between deforestation and climate change is one of a positive feedback loop.[14] The more trees that are removed equals larger effects of climate change which, in turn, results in the loss of more trees.[15]

Deforestation comes in many forms: wildfire, agricultural clearcutting, livestock ranching, and logging for timber, among others.

Causes of deforestation

This screen shot shows a map that highlights countries based on their net change rate of forest area. Areas that appear more blue have a higher net change rate than areas that appear tan. Brown areas indicate a net loss of forest area.
Forest area net change rate per country in 2020

Causes not linked to climate change

Causes due to climate change

Moreland logging trucks
The rate of global tree cover loss has approximately doubled since 2001, to an annual loss approaching an area the size of Italy.[16]
Amazon slash-and-burn agriculture, Colombia
Palm oil plantation, Israel

Effects of deforestation on climate change aspects

Biophysical mechanisms by which forests influence climate

According to a review, north of 50°N, large scale deforestation leads to an overall net global cooling while tropical deforestation leads to substantial warming not just due to CO
2
impacts but also due to other biophysical mechanisms (making carbon-centric metrics inadequate). Irreversible deforestation would result in a permanent rise in the global surface temperature.[17] Moreover, it suggests that standing tropical forests help cool the average global temperature by more than 1 °C.[18][19]

Deforestation of tropical forests may risk triggering tipping points in the climate system and of forest ecosystem collapse which would also have effects on climate change.[20][21][22][23]

Deforestation, particularly in large swaths of the Amazon, where nearly 20% of the rainforest has been clear cut, has climactic effects and effects on water sources as well as on the soil.[24][25] Moreover, the type of land usage after deforestation also produces varied results. When deforested land is converted to pasture land for livestock grazing it has a greater effect on the ecosystem than forest to cropland conversions.[26] Other effect of deforestation in the Amazon rainforest is seen through the greater amount of carbon dioxide emission. The Amazon rainforest absorbs one-fourth of the carbon dioxide emissions on Earth, however, the amount of CO
2
absorbed today decreases by 30% than it was in the 1990s due to deforestation.[27]

Modeling studies have concluded that there are two crucial moments that can lead to devastating effects in the Amazon rainforest which are increase in temperature by 4 °C and deforestation reaching a level of 40%.[28]

Decrease in climate services

Human activity such as deforestation for livestock grazing and fuel wood has led to forest degradation and over extraction resulting in ecosystem biodiversity loss. Loss and degradation of forest has a direct impact on the Earth's diverse flora and fauna and, therefore, on climate change because they are the best defense against CO
2
buildup in the atmosphere.[29][30][31] If there is more foliage photosynthesizing more CO
2
will be absorbed, thereby balancing the potential temperature increases.[32]

Forests are nature's atmospheric carbon sink; plants take in atmospheric carbon dioxide (a greenhouse gas) and convert the carbon into sugars and plant materials through the process of photosynthesis.[33] The carbon is stored within the trees, vegetation, and soil of the forests. Studies show that "intact forests", in fact, do sequester carbon.[34] Examples of large forests that have a significant impact on the balance of carbon include the Amazonian and the Central African rainforests.[35] However, deforestation disrupts the processes of carbon sequestration and affects localized climates. Additionally, cutting down trees plays a role in a positive feedback loop centered around climate change on a much larger scale, as studies are finding.[34]

When a climate changes, this causes the shift in a species' geographic range in order to maintain the climatic conditions (temperature, humidity) it is accustomed to. Ecological zones will shift by approximately 160 km per 1 degree Celsius.[32] A reduction in the area of any habitat, but particularly in forest habitat along with climatic change, enables species invasion and the possibility of biotic homogenization as stronger invasive species can take over weaker species in a fragile ecosystem.[32] Humans will also be impacted by the loss of biodiversity as food, energy, and other 'ecosystem goods and services' patterns are disrupted.[36]

Burning or cutting down trees reverses the effects of carbon sequestration and releases greenhouse gases (including carbon dioxide) into the atmosphere.[35] Furthermore, deforestation changes the landscape and reflectivity of earth's surface, i.e. decreasing Albedo. This results in an increase in the absorption of light energy from the sun in the form of heat, enhancing global warming.[34]

Changes in rainfall

As a consequence of reduced evapotranspiration, precipitation is also reduced. This implies having a hotter and drier climate, and a longer dry season.[37][38] This change in climate has drastic ecological and global impacts including increases in severity and frequency of fires, and disruption in the pollination process that will likely spread beyond the area of deforestation.[38][37]

According to a study published in 2023, tropical deforestation has led to a significant decrease in the amount of observed precipitation.[39] By the year 2100, researchers anticipate that deforestation in the Congo will diminish regional precipitation levels by up to 8-10%.[39]

Forest fires

Main page: Biology:Wildfire

Statistics have shown that there is a direct correlation between forest fires and deforestation. Statistics regarding the Brazilian Amazon area during the early 2000s have shown that fires and the air pollution that accompanies these fires mirror the patterns of deforestation and "high deforestation rates led to frequent fires".[40]

The Amazon rainforest has recently experienced fires that occurred inside the forest when wildfires tend to occur on the outer edges of the forest.[13] Wetlands have faced an increase in forest fires as well.[13] Due to the change in temperature, the climate around forests have become warm and dry, conditions that allow forest fires to occur.[13]

Under unmitigated climate change, by the end of the century, 21% of the Amazon would be vulnerable to post‐fire grass invasion. In 3% of the Amazon, fire return intervals are already shorter than the time required for grass exclusion by canopy recovery, implying a high risk of irreversible shifts to a fire‐maintained degraded forest grassy state. The south‐eastern region of the Amazon is currently at highest risk of irreversible degradation.[41]

According to a study in tropical peatland forest of Borneo, deforestation also contributes to the increase in fire risk.[42]

Control measures and their effects on climate change

Reducing deforestation

Carbon sequestration through forestry

Scioto grove reforestation area

Reforestation, afforestation and agroforestry

Possible methods of reforestation include large-scale industrial plantations, the introduction of trees into existing agricultural systems, small-scale plantations by landowners, the establishment of woodlots on communal lands, and the rehabilitation of degraded areas through tree planting or assisted natural regeneration.[43]

Afforestation at Kanakakunnu

Afforestation is the planting of trees where there was no previous tree coverage. There are three different types of afforestation that could have varying effects on the amount of carbon dioxide that is taken from the atmosphere. The three kinds of afforestation are natural regeneration, commercial plantations, and agroforestry.[44] Although afforestation can help reduce the carbon emissions given off as a result of climate change, natural regeneration tends to be the most effective out of the three.[44] Natural regeneration typically concerns a wide variety of vegetation, making natural forest levels so plants can receive sunlight to undergo photosynthesis. Commercial plantations typically result in mass amounts of lumber, which if used for fuel, will release the stored CO
2
back into the atmosphere. Agroforestry stores energy based on the size and type of plant, meaning that the effect will vary depending on what is planted.[44]

Wood harvesting and supply have reached around 550 million m3 per year, while the total increasing stock of European forests has more than quadrupled during the previous six decades. It now accounts for around 35 billion m3 of forest biomass.[45][46] Since the beginning of the 1990s, the amounts of wood and carbon stored in European forests have increased by 50% due to greater forest area and biomass stocks. Every year, European woods adsorb and store around 155 million tonnes CO
2
equivalent. This is comparable to 10% of all other sectors' emissions in Europe.[45][47][48]

The forestry industry tries to mitigate climate change by boosting carbon storage in growing trees and soils and improving the sustainable supply of renewable raw materials via sustainable forest management.[45][49]

Concerns with forestry projects

Policies and programs

Deforestation in Bolivia

Reducing emissions from deforestation and forest degradation in developing countries

The Bali Action Plan

The Bali Action Plan was developed in December 2007 in Bali, Indonesia.[50][51] It is a direct result of The Kyoto Protocol of December 1997.[52][31] One of the key elements of The Bali Action Plan involves a concerted effort by the member countries of The Kyoto Protocol to enact and create policy approaches that incentivize emissions reduction caused by deforestation and forest degradation in the developing world.[53] It emphasized the importance of sustainable forest management and conservation practices in mitigating climate change. This coupled with the increased attention to carbon emission stocks as a way to provide additional resource flows to the developing countries.[31]

Trillion Tree Campaign

Main page: Organization:Trillion Tree Campaign

The Billion Tree Campaign was launched in 2006 by the United Nations Environment Programme (UNEP) as a response to the challenges of global warming, as well as to a wider array of sustainability challenges, from water supply to biodiversity loss.[54] Its initial target was the planting of one billion trees in 2007. Only one year later in 2008, the campaign's objective was raised to 7 billion trees—a target to be met by the climate change conference that was held in Copenhagen, Denmark in December 2009. Three months before the conference, the 7 billion planted trees mark had been surpassed. In December 2011, after more than 12 billion trees had been planted, UNEP formally handed management of the program over to the not-for-profit Plant-for-the-Planet initiative, based in Munich, Germany.[55]

The Amazon Fund (Brazil)

Main page: Organization:Amazon Fund
Four-year plan to reduce in deforestation in the Amazon

Considered the largest reserve of biological diversity in the world, the Amazon Basin is also the largest Brazilian biome, taking up almost half the nation's territory. The Amazon Basin corresponds to two fifths of South America's territory. Its area of approximately seven million square kilometers covers the largest hydrographic network on the planet, through which runs about one fifth of the fresh water on the world's surface. Deforestation in the Amazon rainforest is a major cause to climate change due to the decreasing number of trees available to capture increasing carbon dioxide levels in the atmosphere.[56]

The Amazon Fund is aimed at raising donations for non-reimbursable investments in efforts to prevent, monitor and combat deforestation, as well as to promote the preservation and sustainable use of forests in the Amazon Biome, under the terms of Decree N.º 6,527, dated August 1, 2008.[57] The Norwegian Government, which is the largest donor to the fund, froze its funding in 2019 over deforestation concerns. Norway has tied the resumption of funding to proof of a reduction in deforestation.[58]

The Amazon Fund supports the following areas: management of public forests and protected areas, environmental control, monitoring and inspection, sustainable forest management, economic activities created with sustainable use of forests, ecological and economic zoning, territorial arrangement and agricultural regulation, preservation and sustainable use of biodiversity, and recovery of deforested areas. Besides those, the Amazon Fund may use up to 20% of its donations to support the development of systems to monitor and control deforestation in other Brazilian biomes and in biomes of other tropical countries.[57]

See also

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