Asymmetric Intensification Exacerbates Global Cropland Use and Emission Gap: A Macroeconomics Perspective

Global Geographic Reconfiguration of Food Production: Decoupling Efficiency and Emissions

Since the 20th century, global farmland use has undergone profound structural changes. A study published in *Nature Climate Change* in 2026, tracking data from 174 countries over three decades, reveals an alarming trend: the expansion of global farmland and improvements in efficiency are highly asymmetric, creating a "scissors gap" between the Global North and Global South in the environmental costs of food production.

Global South: The Cost of Expansion

The study shows that between 1992 and 2021, 88% of the global expansion in harvested area occurred in developing countries (the "Global South"). To meet domestic demand and global exports, these countries have converted large areas of forests and grasslands into farmland, accounting for 82% of the growth in greenhouse gas emissions from farmland. Among them, low-efficiency expansion countries have an emission intensity as high as 1.7 kgCO₂e/Mcal, far above the global average. These countries often lack advanced agricultural technology, capital investment, and environmental regulation, and their growth model relies heavily on extensive expansion of land area.

From a macroeconomic perspective, this reflects a kind of "resource curse": developing countries with abundant land resources, when participating in global agricultural trade, are prone to falling into a cycle of low value-added and high environmental costs. For example, the expansion of oil crops (such as palm oil and soybeans) is a major driver of rising emission intensity, as these crops often involve clearing forestland in tropical regions, causing significant carbon loss.

Global North: Efficiency Gains and Emission Shifting

In contrast, developed countries (especially Europe and North America) have experienced a process of "efficient contraction." Through technological progress, intensive land use, and policy-driven fallowing, these countries reduced their harvested area by 12% between 1992 and 2021, while lowering emission intensity to 0.4 kgCO₂e/Mcal, only a quarter of that of inefficient countries. However, this achievement has not come without cost: during the same period, the crop imports of these efficient contraction countries surged by 4.2 times, and the sources of imports were highly concentrated in low-efficiency expansion countries with high emission intensity.

This is essentially a "trade leakage" of environmental burdens—developed countries have achieved an apparent decline in their own emissions by outsourcing high-emission production processes, but have driven up total global emissions. From the perspective of the global trading system, agricultural liberalization under the WTO framework has exacerbated this asymmetry: comparative advantage theory directs production to resource-rich countries, but the price mechanism fails to incorporate environmental costs, leaving the externalities of the global food system unaccounted for.

Reconstructing the Global Greenhouse Gas Emissions AccountTraditionally, countries have followed the "territorial principle" when accounting for greenhouse gas emissions, counting only emissions within their own borders. However, this study suggests that carbon footprints calculated under the "consumption principle" may be fairer: developed countries, as net consumers of agricultural products, have long had their "embedded emissions" underestimated. The principle of "common but differentiated responsibilities" in international climate negotiations thus faces new challenges—developed countries reduce production-side emissions in their climate pledges, but consumption-side demand has not decreased; instead, it has been transferred to developing countries through trade.

Over the long-term economic cycle, the persistence of this pattern depends on three variables: (1) the pace at which agricultural technology in the Global South catches up; (2) the diffusion effect of policies such as the Carbon Border Adjustment Mechanism (CBAM); and (3) the impact of global population growth and dietary changes on total food demand. If production efficiency in inefficiently expanding countries cannot be rapidly improved, total emissions from the global food system will continue to rise, exacerbating the climate change feedback loop.