Forests influence the global climate through carbon storage, surface energy balance, water cycling, and biodiversity. Removing forest cover accelerates climate change because it converts long-term carbon sinks into sources, alters surface properties that control temperature and rainfall, and undermines ecological functions that moderate extreme events. Scientific assessments by the Intergovernmental Panel on Climate Change establish that land-use change, including deforestation, is an ongoing contributor to atmospheric greenhouse gas concentrations, and national and global carbon budgets consistently identify forest loss as a major source of emissions.
Carbon balance and emissions
When trees are cut or burned, carbon contained in biomass and soils is released as carbon dioxide and other greenhouse gases. Corinne Le Quéré at the Tyndall Centre and University of East Anglia leads the Global Carbon Project, which documents persistent emissions from land-use change and stresses that preventing forest loss is essential to lower net anthropogenic emissions. Beyond the immediate pulse of emissions from logging and fires, deforestation reduces the landscape’s capacity to re-sequester carbon. Intact forests continue to remove carbon from the atmosphere as they grow, but conversion of forests to agriculture or pasture replaces that ongoing sink with land that typically stores far less carbon.
Climate feedbacks and regional impacts
Changes in forest cover affect albedo, evapotranspiration, and cloud formation. In many tropical regions, large-scale deforestation reduces evapotranspiration and can weaken regional rainfall systems, amplifying drought risk. In boreal and temperate zones, converting dark forest canopies to lighter surfaces may increase reflected solar radiation but also promote soil warming and permafrost thaw in northern latitudes, producing complex feedbacks. Gavin A. Schmidt at the NASA Goddard Institute for Space Studies highlights that biophysical changes from land cover alteration interact with atmospheric processes, meaning local and regional deforestation can have climatic effects that extend beyond the immediate area.
Soil, fire, and aerosol pathways
Soils disturbed by clearing can emit stored carbon and expose peatlands that, when drained or burned, release large and long-lasting greenhouse gas fluxes. Fire used to clear land produces not only carbon dioxide but also black carbon and aerosols that alter radiative forcing and can accelerate glacier and snowmelt when deposited on ice. The Food and Agriculture Organization of the United Nations monitors global forest resources and documents how land-management practices influence these pathways, emphasizing that prevention and restoration policies reduce multiple sources of emissions.
Human, cultural, and environmental consequences
Deforestation disproportionately affects communities whose livelihoods and cultures are tied to forests, including Indigenous peoples in the Amazon, Congo Basin, and Southeast Asia. Loss of forest-mediated rainfall and increased fire risk threaten agriculture, water security, and biodiversity, reducing resilience to warming. International and national mitigation strategies therefore pair emissions accounting with rights-based approaches to forest governance. Scientific consensus framed by institutions such as the Intergovernmental Panel on Climate Change and data synthesis by groups like the Global Carbon Project indicate that avoiding deforestation and restoring forests are necessary components of credible climate mitigation pathways, alongside rapid reductions in fossil fuel emissions.