Virtually all global deforestation is caused by humans. Agricultural expansion alone drives nearly 90% of forest clearing worldwide, and when you add logging, infrastructure, and mining, human activity accounts for the overwhelming majority of forest loss on the planet. Natural events like windstorms, landslides, and lightning-caused fires do destroy forests, but their contribution is small compared to deliberate clearing for farmland, pasture, and development.
Agriculture Is the Dominant Force
Between 2000 and 2020, the world lost nearly 100 million hectares of forest, and agricultural expansion was responsible for almost 90% of it. Within that, cropland expansion accounted for about 50% and livestock grazing for roughly 38.5%. These aren’t just industrial operations: small-scale farming caused 68% of agriculture-driven deforestation globally, while large-scale commercial farming contributed the remaining 32%.
The commodities behind this clearing are concentrated. Beef production is the single largest driver, responsible for 41% of tropical deforestation as forests are converted to cattle pasture. Oilseed crops, primarily palm oil and soy, account for another 18%. Add forestry products like paper and timber, and those three categories together cover nearly three-quarters of tropical forest loss. In the Amazon specifically, cattle ranching is responsible for roughly 80% of deforestation, making it the clearest example of how a single industry can reshape an entire biome.
Infrastructure and Urban Expansion
Roads, highways, and other transportation infrastructure have a reach that extends well beyond the land they physically occupy. A 2026 analysis published in Nature Communications found that forest loss linked to transportation infrastructure totaled 4.26 million square kilometers, equivalent to 10.7% of the world’s forest cover as of 2020. The damage follows a clear distance pattern, with the heaviest losses closest to roads and significant impacts extending up to 5 kilometers out. Roads don’t just remove trees directly. They open previously inaccessible forest to settlers, loggers, and farmers, creating a ripple effect of clearing that continues long after construction ends.
Natural Causes Play a Minor Role
Forests do experience natural disturbances. Windstorms topple trees, lightning strikes start fires, and landslides strip hillsides. But these events account for a relatively small share of total forest loss. In one detailed study of the Amazon’s “arc of deforestation” using repeated aerial laser scanning, researchers found that human activity (clearing, logging, and fire) directly impacted 4.2% of the surveyed forest area over the study period, while windthrows affected just 2.7%. Another 14.7% showed signs of smaller mixed disturbances, both natural and human in origin.
The important distinction is what happens afterward. Natural disturbances like windstorms typically leave soil and root systems intact, allowing forests to regenerate. Human-caused deforestation usually converts land permanently to agriculture or development, meaning the forest doesn’t come back. The FAO defines deforestation specifically as a change in land use, not just a temporary loss of tree cover. A forest that regrows after a storm was never truly “deforested” by that standard.
Climate Change Blurs the Line
Some forest loss that looks natural on the surface has human fingerprints underneath. Wildfires are the clearest example. A 2025 study in Nature found that extreme fire weather years are now 88% to 152% more likely across global forested lands compared to pre-industrial conditions, with the sharpest increases in temperate and Amazonian forests. These fires are “natural” in the sense that lightning or weather conditions ignite them, but their increasing frequency and severity trace back to human-caused climate change.
Drought stress works similarly. As temperatures rise, forests in tropical and subtropical regions face longer dry seasons that weaken trees, making them more vulnerable to fire, insect outbreaks, and die-offs. In the Amazon, fire accounted for 2.8% of directly human-caused forest damage in one study, but fire behavior itself is shaped by both intentional land clearing (farmers using fire to prepare fields) and climate-driven drying. Separating “human” from “natural” causes becomes increasingly artificial when human activity is changing the climate that governs natural systems.
Global Forest Loss Is Slowing, but Still Massive
The FAO’s 2025 Global Forest Resources Assessment estimates that 489 million hectares of forest have been lost to deforestation since 1990. The rate has declined over time: from 17.6 million hectares per year in the 1990s, to 13.6 million hectares per year between 2000 and 2015, to 10.9 million hectares per year in the most recent decade. Net forest loss, which accounts for new forest growth and planting, dropped from 10.7 million hectares annually in the 1990s to 4.12 million hectares per year between 2015 and 2025.
That net figure can be misleading. New tree plantations and regrowing secondary forests don’t replace the biodiversity or carbon storage of old-growth forest. A rubber plantation counts as “forest” under the FAO’s definition (which requires just 10% canopy cover, 0.5 hectares in area, and 5 meters in height), but it functions nothing like the rainforest it replaced. The slowing rate of loss is genuinely positive, yet the scale remains enormous: losing 10.9 million hectares of forest per year is roughly equivalent to clearing a forest the size of Iceland annually, and the vast majority of that clearing is a direct human choice.