Land use change refers to how humans transform natural landscapes into agricultural fields, pastures, cities and infrastructure, and how these uses shift over time. Research shows that such changes are a major driver of biodiversity loss, climate change impacts and alterations to the water and nutrient cycles.

Conversion of forests to cropland or pasture removes habitat, fragments remaining ecosystems and isolates populations. This raises extinction risk, reduces genetic diversity and alters species interactions. Tropical deforestation is especially critical because these regions hold a large share of global biodiversity and carbon stocks. Even when vegetation regrows, recovering original species richness and ecological function can take decades or longer.

Land use change also affects climate in two main ways. First, it releases carbon stored in vegetation and soils, contributing to greenhouse gas emissions. Second, it alters surface properties such as albedo, roughness and evapotranspiration. For example, clearing dark, rough forest to create brighter cropland changes how much solar energy is absorbed and how heat and moisture are exchanged with the atmosphere. These biophysical effects can locally warm or cool and can shift rainfall patterns.

Researchers emphasize that impacts depend on previous land use, new use, regional climate and management practices. Intensification of agriculture can spare land in some cases but may also increase pollution and soil degradation. Sustainable land management, restoration of degraded ecosystems and planning that balances food production, conservation and climate goals are central strategies. Ongoing monitoring using field data, modeling and satellite observations is crucial to understand trajectories and support policy decisions.