Forests cover about 4.14 billion hectares, roughly a third of the world's land. Deforestation means clearing forest and turning the land over to another use, most often farming, but also mining, roads or settlements. FAO estimates that about 489 million hectares were deforested between 1990 and 2025 and that clearing still averaged 10.9 million hectares a year in 2015–2025. New forest growing elsewhere makes up for part of this, but the world's total forest area is still shrinking, by about 4.1 million hectares a year. Nearly nine-tenths of the deforestation since 1990 took place in the tropics, and over the past decade clearing for permanent agriculture, such as pasture and crops, accounted for about 86% of it.
The losses fall hardest on people who depend directly on forests for food, fuel and income, and on places where poverty and conflict leave few alternatives. In the Democratic Republic of the Congo, small-scale shifting cultivation caused most primary forest loss between 2002 and 2025, firewood and charcoal remain the main source of energy, and conflict in the east has pushed communities into new forest areas. In Bolivia, fires most likely set by people, together with the spread of cattle ranching and soy, drove primary forest loss in 2025 to its second-highest level on record. The effects reach far beyond these places: the loss of tropical primary forest released about 3.1 billion tonnes of greenhouse gases in 2024, destroys habitat for wildlife, and leaves the remaining forest more exposed to fire, which caused 42% of all tree cover loss worldwide in 2025.
How deforestation is measured
Two kinds of data are used. FAO compiles national statistics reported by countries in its Global Forest Resources Assessment, which also tracks SDG 15 (Life on Land); SDG target 15.2 called for halting deforestation by 2020. Satellite data, such as the University of Maryland maps published on Global Forest Watch, record where tree cover disappears each year. The two measure different things:
Deforestation
FAO defines deforestation as the conversion of forest to another land use, such as agriculture or infrastructure. Forest that is logged or burned but remains forest land is therefore not counted as deforested, even when it loses much of its carbon and wildlife.
Tree cover loss
Satellite data record any removal or death of trees, whether from clearing, harvesting of plantations and managed forests, fire, disease or storms. Tree cover loss is therefore not the same as deforestation: in 2025, fires caused 42% of the 25.5 million hectares of tree cover lost worldwide, and much burned or harvested forest can grow back.
Gross and net change
Deforestation is a gross figure. Net change subtracts the forest that spreads naturally or is planted elsewhere, so it is smaller: for 2015–2025, FAO estimates 10.9 million hectares deforested a year but a net loss of 4.12 million hectares. A net figure can hide the replacement of old natural forest by young or planted trees.
Primary forest and degradation
Many trackers focus on humid tropical primary forest: old-growth forest that has not been cleared in recent years and is especially rich in carbon and species. Degradation, where forest remains but is thinned by logging or fire, is tracked separately; in 2024 it affected 8.8 million hectares of tropical moist forest.