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- Dictionarydeforestation/ˌdiːfɒrɪˈsteɪʃn/
noun
- 1. the action of clearing a wide area of trees: "a key aim is to try to halt widespread deforestation in the Amazon"
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Jun 20, 2024 · Learn what deforestation is, why it happens, and how it affects the environment and biodiversity. Find out about the causes, effects, and examples of deforestation in different regions and historical periods.
Deforestation results in habitat destruction which in turn leads to biodiversity loss. Deforestation also leads to extinction of animals and plants, changes to the local climate, and displacement of indigenous people who live in forests.
Dec 7, 2022 · Learn why forests are essential for climate, biodiversity, and human health, and how deforestation threatens them. Find out the main drivers of tree loss, the impacts on ecosystems and people, and the ways to stop and reverse it.
- Christina Nunez
- Overview
- History
- Modern deforestation
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deforestation, the clearing or thinning of forests by humans. Deforestation represents one of the largest issues in global land use. Estimates of deforestation traditionally are based on the area of forest cleared for human use, including removal of the trees for wood products and for croplands and grazing lands. In the practice of clear-cutting, a...
Conversion of forests to land used for other purposes has a long history. Earth’s croplands, which cover about 49 million square km (18.9 million square miles), are mostly deforested land. Most present-day croplands receive enough rain and are warm enough to have once supported forests of one kind or another. Only about 1 million square km (390,000 square miles) of cropland are in areas that would have been cool boreal forests, as in Scandinavia and northern Canada. Much of the remainder was once moist subtropical or tropical forest or, in eastern North America, western Europe, and eastern China, temperate forest.
The extent to which forests have become Earth’s grazing lands is much more difficult to assess. Cattle or sheep pastures in North America or Europe are easy to identify, and they support large numbers of animals. At least 2 million square km (772,204 square miles) of such forests have been cleared for grazing lands. Less certain are the humid tropical forests and some drier tropical woodlands that have been cleared for grazing. These often support only very low numbers of domestic grazing animals, but they may still be considered grazing lands by national authorities. Almost half the world is made up of “drylands”—areas too dry to support large numbers of trees—and most are considered grazing lands. There, goats, sheep, and cattle may harm what few trees are able to grow.
Although most of the areas cleared for crops and grazing represent permanent and continuing deforestation, deforestation can be transient. About half of eastern North America lay deforested in the 1870s, almost all of it having been deforested at least once since European colonization in the early 1600s. Since the 1870s the region’s forest cover has increased, though most of the trees are relatively young. Few places exist in eastern North America that retain stands of uncut old-growth forests.
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The United Nations Food and Agriculture Organization (FAO) estimates that the annual rate of deforestation is about 1.3 million square km per decade, though the rate has slowed in some places in the early 21st century as a result of enhanced forest management practices and the establishment of nature preserves. The greatest deforestation is occurring in the tropics, where a wide variety of forests exists. They range from rainforests that are hot and wet year-round to forests that are merely humid and moist, to those in which trees in varying proportions lose their leaves in the dry season, and to dry open woodlands. Because boundaries between these categories are inevitably arbitrary, estimates differ regarding how much deforestation has occurred in the tropics.
A major contributor to tropical deforestation is the practice of slash-and-burn agriculture, or swidden agriculture (see also shifting agriculture). Small-scale farmers clear forests by burning them and then grow crops in the soils fertilized by the ashes. Typically, the land produces for only a few years and then must be abandoned and new patches of forest burned. Fire is also commonly used to clear forests in Southeast Asia, tropical Africa, and the Americas for permanent oil palm plantations.
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Additional human activities that contribute to tropical deforestation include commercial logging and land clearing for cattle ranches and plantations of rubber trees, oil palm, and other economically valuable trees.
The Amazon Rainforest is the largest remaining block of humid tropical forest, and about two-thirds of it is in Brazil. (The rest lies along that country’s borders to the west and to the north.) Studies in the Amazon reveal that about 5,000 square km (1,931 square miles) are at least partially logged each year. In addition, each year fires burn an area about half as large as the areas that are cleared. Even when the forest is not entirely cleared, what remains is often a patchwork of forests and fields or, in the event of more intensive deforestation, “islands” of forest surrounded by a “sea” of deforested areas.
Learn about the causes and effects of deforestation, the clearing or thinning of forests by humans. Explore the global patterns and trends of deforestation, especially in the tropics, and the challenges of conservation and restoration.
Explore long-term changes in deforestation and forest loss across the world today. Learn about the historical trends, causes, and impacts of deforestation, and the potential for restoration and conservation.
- Hannah Ritchie, Max Roser
- 2021
Dec 4, 2018 · Learn about the causes, impacts, and solutions of deforestation and forest degradation, which threaten forests and wildlife around the world. Find out how WWF works to protect and restore forests and their benefits for people and nature.
Oct 11, 2022 · Learn what deforestation is, why it matters and how it affects the climate, biodiversity, water and soil. Find out the main drivers of deforestation, such as agriculture, logging and palm oil, and what can be done to stop and reverse it.
