Agricultural expansion is driven primarily by population growth, rising incomes, and shifting diets, and it ranks among the largest single forces reshaping Earth’s land surface, climate, and biodiversity. Between 1980 and 2000, more than 80% of new farmland in the tropics was carved out of intact or disturbed forests. The consequences ripple far beyond the cleared land itself, touching groundwater reserves, disease dynamics, and the livelihoods of Indigenous communities thousands of kilometers from the consumers whose demand set the process in motion.
Population, Income, and Changing Diets
The most fundamental driver of agricultural expansion is straightforward: more people eating more resource-intensive food. As global population has grown, so has total demand for crops and animal products. But population size alone does not explain the scale of land conversion. Rising incomes in low- and middle-income countries shift diets away from staple grains and toward meat, dairy, and processed oils, all of which require significantly more land per calorie than plant-based staples. Modeling work shows that cropland expansion in baseline scenarios is shaped largely by increasing total demand for crops and livestock products, with managed pasture and natural land bearing the cost.1PubMed Central. Food matters: Dietary shifts increase the feasibility of 1.5°C pathways in line with the Paris Agreement Yield improvements have partially offset this rising demand, but not enough to prevent farmland from spreading into forests and grasslands.2Global Environmental Change. Drivers for global agricultural land use change: The nexus of diet, population, yield and bioenergy
Bioenergy adds another layer. As governments mandate blending biofuels into transport fuel, crops like sugarcane, soy, and oil palm serve double duty as food and energy feedstocks. Palm oil illustrates this well: it goes into cooking oil, processed food, cosmetics, and biodiesel. Roughly three-quarters of tropical deforestation in the twenty-first century has been linked to the expansion of agriculture and forest plantations, with palm oil standing out as one of the most significant commodities in terms of embodied deforestation.3Agricultural and Food Economics. Food, biofuels or cosmetics? Land-use, deforestation and CO2 emissions embodied in the palm oil consumption of four European countries
Global Trade and Displaced Land Use
Consumers in wealthy countries rarely see the land-use footprint of the products they buy, but trade routes connect supermarket shelves in Europe or China to freshly cleared forest in Brazil or Indonesia. Production of commercial agricultural commodities for both domestic and foreign markets is increasingly driving tropical land clearing, with over a third of the associated land-use change embodied in exports by 2011, up from about a fifth in 2000.4Environmental Research Letters. Trading forests: land-use change and carbon emissions embodied in production and exports of forest-risk commodities Major flows include Latin American beef and soybean exports to Europe, China, and the Middle East, while Southeast Asian palm oil and wood products flow primarily to China, India, and the European Union.
The relationship between trade and deforestation is not always intuitive. In Brazil, municipalities where a larger share of soybean production stayed within the domestic market showed stronger statistical associations with deforestation than municipalities exporting more.5Scientific Reports. Complex relationships between soybean trade destination and tropical deforestation That finding complicates the narrative that international demand alone is to blame. Domestic consumption, infrastructure development, and land speculation all feed into the picture.
Forests as the Primary Casualty
Across the tropics between 1980 and 2000, more than 55% of new agricultural land came from intact forests, and another 28% came from disturbed forests.6PubMed Central. Tropical forests were the primary sources of new agricultural land in the 1980s and 1990s That pattern has continued into the twenty-first century, with satellite imagery confirming that cultivated areas have expanded into forests, including primary and protected forests, in regions like the Southeast Asian highlands.7Nature Geoscience. Highland cropland expansion and forest loss in Southeast Asia in the twenty-first century
Pasture for cattle deserves special attention. Projections for the Neotropics (Central and South America) indicate that the expansion of pasture into forest will be greater than that of cropland, making livestock grazing land the dominant use replacing forest after clearing.8Global Environmental Change. Projecting land use changes in the Neotropics: The geography of pasture expansion into forest The Amazon and Cerrado biomes in Brazil are particularly affected, but cattle-driven deforestation also plays out in parts of Central America and sub-Saharan Africa.
Biodiversity Under Pressure
When forests and grasslands become farms, the species that lived there face shrinking habitat, fragmented populations, and in many cases extinction risk. One projection found that nearly 88% of the species studied would lose habitat to agricultural expansion by 2050, with over 1,280 species projected to lose at least a quarter of their remaining habitat.9Nature Sustainability. Proactive conservation to prevent habitat losses to agricultural expansion The threat is not limited to tropical forests. Savannas, wetlands, and drylands contain unique species assemblages that are often less well protected and receive less public attention than rainforests.
Hotspot mapping shows that the areas most at risk of conversion to multiple crops overlap with regions of high biodiversity value.10Biological Conservation. Global hotspots of conversion risk from multiple crop expansion The combination of suitable growing conditions and high biodiversity is not a coincidence: warm, wet regions with rich soils tend to support both productive agriculture and diverse ecosystems. This geographic overlap means that the easiest land to farm is often the most ecologically valuable land to protect.
Carbon Lost From Soil and Vegetation
Clearing forests and grasslands for farming releases carbon in two main ways: the above-ground vegetation is burned or left to decompose, and the soil itself begins losing stored organic carbon. A study in Guam found that converting secondary forest to continuous cultivation reduced soil organic carbon by roughly 44% within five years.11Agriculture, Ecosystems & Environment. The impact of land clearing and agricultural practices on soil organic C fractions and CO2 efflux in the Northern Guam aquifer A broader meta-analysis of dryland regions found that clearing forests for cropland reduced soil organic carbon stocks in the top meter by about 24%, while clearing grasslands reduced stocks by roughly 11%.12PubMed. Effects of land clearing for agriculture on soil organic carbon stocks in drylands: A meta-analysis
These losses are easy to undercount. Researchers analyzing land-use data for the United States found that previous carbon budget analyses underestimated emissions because they overestimated recent cropland abandonment and forest recovery. When those errors were corrected, the data shifted from showing a modest carbon sink to showing a moderate carbon source.13PubMed. Largely underestimated carbon emission from land use and land cover change in the conterminous United States
Peatlands represent an extreme case. In Borneo, average net carbon dioxide emissions from 2001 to 2016 were about 461 Tg COâ‚‚ per year, with emissions per unit area in peatlands running roughly three to fifteen times higher than those from mineral soils.14PubMed Central. Carbon dioxide emissions through land use change, fire, and oxidative peat decomposition in Borneo Draining peat for oil palm or pulpwood plantations exposes centuries of accumulated organic matter to oxidation and fire, making these conversions disproportionately carbon-intensive.
Water Depletion and Nutrient Pollution
Expanding irrigated agriculture draws heavily on both surface water and groundwater. In South Asia, irrigation expansion substantially worsened the rate at which terrestrial water storage was depleting, amplifying the drying trend already set in motion by climate change.15Nature Water. Irrigation-induced land water depletion aggravated by climate change In the United States, the High Plains aquifer and California’s Central Valley account for about half of total groundwater depletion since 1900, driven overwhelmingly by irrigation. Much of the water pumped in the central and southern High Plains is fossil groundwater, recharged over thousands of years and now being extracted far faster than nature can replenish it.16PubMed Central. Groundwater depletion and sustainability of irrigation in the US High Plains and Central Valley
Fertilizer use adds a parallel water-quality problem. Excess nitrogen and phosphorus wash off farmland into rivers and lakes, fueling algal blooms that deplete oxygen and kill aquatic life. In heavily farmed regions, the slow seepage of phosphorus from overfertilized soils can keep lakes in a persistently degraded state for decades, even after fertilizer application is reduced.17PubMed Central. Eutrophication of aquatic ecosystems: bistability and soil phosphorus China offers a stark example: increased fertilizer application has improved crop yields and food security, but has also produced serious eutrophication in inland and coastal waters.18Journal of Cleaner Production. Nitrogen and phosphorus losses and eutrophication potential associated with fertilizer application to cropland in China
Soil Erosion From Clearing Methods
How land is cleared matters almost as much as whether it is cleared. Research in a tropical rain forest in Nigeria found that maximum soil erosion occurred on plots that were mechanically cleared with heavy equipment and then tilled conventionally.19Journal of Environmental Management. Effects of land clearing techniques and tillage systems on runoff and soil erosion in a tropical rain forest in Nigeria The combination of removing root systems that hold soil in place and breaking up the soil surface with machinery leaves the ground vulnerable to heavy tropical rains. Once topsoil is lost, the cleared land can quickly become unproductive, pushing farmers to clear yet more forest in a cycle of degradation.
Consequences for Indigenous and Forest-Dependent Communities
Agricultural expansion does not take place on empty land. In the Argentine Dry Chaco, over 400 Indigenous communities have been studied using participatory mapping combined with satellite deforestation data. By 2021, these communities had lost an average of 21% of their forests, with a third of communities experiencing 10 to 35% reductions in the availability of plant and animal resources between 2001 and 2021. Access restrictions increased substantially, and communities had to travel more than 10 km further to reach natural water sources.20PubMed Central. Impacts of agricultural expansion on the resource availability of forest-dependent Indigenous communities in the Dry Chaco The pattern is not unique to Argentina. Forest-dependent communities across tropical dry forests face similar ecological marginalization as surrounding land is converted to soy, cattle, or other export-oriented agriculture.
Zoonotic Disease Risk at the Forest Edge
Converting forests to farmland does more than release carbon and displace species. It also reshapes the interface between wildlife, livestock, and people in ways that increase the risk of infectious disease spillover. Agricultural intensification and environmental change have been repeatedly associated with an increased risk of zoonotic disease emergence, driven by the expanding human footprint on previously wild landscapes.21PubMed Central. Zoonosis emergence linked to agricultural intensification and environmental change Habitat fragmentation, biodiversity loss, high livestock densities, and wildlife hunting are all facets of food systems linked to varying degrees with spillover events.22The Lancet Planetary Health. Exploring scenarios for the food system–zoonotic risk interface
Research on Ebola outbreaks found that overlapping species range edges and heightened habitat diversity increased outbreak risk, while gradual transition zones with more rangeland acted as a buffer.23Frontiers in Public Health. Evidence of repeated zoonotic pathogen spillover events at ecological boundaries In other words, the sharp, fragmented boundaries that agricultural expansion creates at forest edges are precisely the conditions that favor disease emergence.
Why Higher Yields Do Not Always Spare Land
An intuitive assumption is that if farmers can grow more food per hectare, less land needs to be cleared. That logic holds in some cases but fails in others due to the rebound effect. When productivity gains make a crop more profitable, they can encourage farmers to plant even more of it. Research across multiple countries and commodities found that intensification produced a rebound effect in the short run in low- and middle-income countries, particularly for high-value crops with strong market demand. Over the long run, a “backfire” rebound persisted for commodities like rubber and soybean in key producer countries, meaning that yield improvements actually led to more land being cultivated, not less. However, intensification of staple cereals like wheat and rice did result in genuine land sparing.24Environmental Research Letters. Agricultural intensification and land use change: assessing country-level induced intensification, land sparing and rebound effect
The theoretical potential is real. One modeling study estimated that if crop production were optimally allocated to the highest-yielding land, between 37% and 48% of currently cultivated cropland could be taken out of production.25PLOS ONE. Global cropland could be almost halved: Assessment of land saving potentials under different strategies and implications for agricultural markets But in practice, those savings rarely materialize without accompanying policy. A study of oil palm smallholders in Indonesia found that while low land efficiency meant about half the cultivated area could theoretically be spared, the rebound effect offset roughly half of the conservation benefit when efficiency improved.26American Journal of Agricultural Economics. Technical efficiency and farmland expansion: Evidence from oil palm smallholders in Indonesia The lesson is consistent: yield gains need to be paired with land-use regulations and protection of high-value ecosystems, or the economic incentive to expand wins out.
Government Subsidies as Accelerants
Policy failures can be just as powerful a driver as market demand. Subsidized state-led migration programs have had critical environmental impacts in previously intact but economically marginalized regions, including deforestation, forest degradation from timber extraction and charcoal production, and overhunting. These resettlement programs create a self-reinforcing cycle: new settlements justify infrastructure investments, which attract more migrants and stimulate demand for more forest land.27Biological Conservation. Subsidized agricultural resettlements as drivers of tropical deforestation Indonesia’s transmigration program and Brazil’s colonization schemes in the Amazon are among the most documented examples, but subsidized frontier expansion has played a role across sub-Saharan Africa and Southeast Asia as well.
Corporate Zero-Deforestation Pledges
Hundreds of companies in the palm oil, soy, beef, and timber sectors have adopted zero-deforestation commitments. These pledges represent a real advance in private governance, but the evidence on their effectiveness is mixed. In Indonesia’s palm oil sector, concessions linked to companies with zero-deforestation commitments had low deforestation rates, less than 1% per year from 2018 to 2020. Yet concessions not covered by such commitments experienced similar reductions, meaning the pledges showed no additional effect beyond background trends.28PubMed Central. Zero-deforestation commitments in Indonesia’s palm oil sector achieve high compliance but no additionality
In Brazil’s soy sector, the picture is more nuanced. The Amazon Soy Moratorium reduced direct soy-related deforestation in participating municipalities by an estimated 57%. But adoption in the Cerrado, where deforestation pressure is now concentrated, has been far lower: only seven of 129 soybean exporting companies had a zero-deforestation commitment. Had those companies implemented their pledges earlier, they could have contributed to avoiding roughly 46% of direct soy-related deforestation in the Cerrado between 2006 and 2015.29Environmental Research Letters. Gaps in adoption and implementation limit the current and potential effectiveness of zero-deforestation supply chain policies for soy The gap between what these commitments could achieve and what they actually deliver underscores a broader theme: voluntary measures need wider adoption and stronger enforcement to move the needle.30PubMed Central. Corporate zero deforestation commitments and company-internal organizational change
Land Sparing Versus Land Sharing
Conservation scientists have debated two broad strategies for reconciling food production with biodiversity. Land sharing integrates wildlife-friendly practices into lower-yielding farms. Land sparing concentrates production on high-yielding farms and sets aside separate areas as protected habitat. A foundational study comparing bird and tree species across agricultural intensity gradients in Ghana and India found that more species were hurt by farming than benefited from it, and that land sparing was the more promising strategy at both current and projected future levels of food demand.31PubMed. Reconciling food production and biodiversity conservation: land sharing and land sparing compared
That said, the debate is less settled than the framing suggests. A review of 52 studies found that land sharing is typically conceptualized as environmentally friendly or low-yielding agriculture, while land sparing is defined as high-yielding agriculture plus preserved natural habitats.32Conservation Science and Practice. Land sharing versus land sparing—What outcomes are compared between which land uses? How you define each strategy shapes which one “wins.” In practice, most real landscapes involve a blend of both approaches, and the optimal mix depends on local ecology, land tenure systems, and governance capacity. The framework is useful for thinking about trade-offs, less useful as a one-size-fits-all prescription.
How Climate Change Reshapes the Map
Climate change is set to redraw where farming is viable, creating new pressures on ecosystems that have so far been too cold or too dry for agriculture. By the end of this century, between 240 and 320 million hectares of land currently used for forestry could become more suitable for agriculture, depending on the emissions pathway. That is roughly the area of India. The shift is concentrated in boreal regions, particularly western Canada and Siberia, as well as parts of the United States and China.33Nature Climate Change. Climate change will exacerbate land conflict between agriculture and timber production
At the same time, some currently productive areas will become less suitable. Modeling under a mid-range emissions scenario projects that while the total area with some agricultural suitability increases globally, highly suitable land actually shrinks, with the gains concentrated in marginally suitable areas.34PLOS ONE. Global Agricultural Land Resources – A High Resolution Suitability Evaluation and Its Perspectives until 2100 under Climate Change Conditions Future scenarios for land-use change diverge sharply depending on socioeconomic assumptions: under a fragmented, nationalistic development path, agricultural land could expand by nearly 826 million hectares between 2010 and 2050, whereas a more sustainable trajectory could see it contract by over 305 million hectares.35Global Environmental Change. Exploring SSP land-use dynamics using the IMAGE model: Regional and gridded scenarios of land-use change and land-based climate change mitigation The range between those two futures is enormous and hinges largely on policy choices made in the next decade or two.
Dietary Shifts and Alternative Proteins
Because livestock production is the single largest user of agricultural land globally, dietary change is one of the most powerful levers available. Shifting diets toward fewer animal products could meaningfully expand the feasibility of keeping global warming below 1.5°C by freeing up cropland and pasture.1PubMed Central. Food matters: Dietary shifts increase the feasibility of 1.5°C pathways in line with the Paris Agreement This does not require universal veganism. Even modest reductions in beef and dairy consumption in high-income countries, where per capita meat intake is highest, would reduce pressure on the land base substantially.
Emerging technologies could eventually complement dietary change. Cellular agriculture, which grows animal proteins from cell cultures rather than whole animals, has the theoretical potential to free up land from traditional agricultural use while also reducing water consumption and greenhouse gas emissions.36ScienceDirect. The foundations of cellular agriculture: science, technology, sustainability and society Whether that potential is realized depends on whether the technology can scale cost-effectively and gain consumer acceptance, neither of which is guaranteed. For now, the more immediate and proven pathway is a combination of reducing food waste, shifting diets, and coupling yield improvements with strong land-use governance so that efficiency gains translate into conservation rather than more expansion.