Greenhouse Gas Emission Dynamics in Agricultural Systems

Agricultural systems are both victims and drivers of climate change. They contribute a substantial share of global greenhouse gas (GHG) emissions, estimated at roughly 25–30 per cent of anthropogenic totals, through a complex interplay of biological, chemical and energy‐related processes. Key on-farm sources include enteric fermentation by ruminant livestock, microbial transformations in soils that produce nitrous oxide, and methane and carbon dioxide from manure management. Land use change—particularly deforestation and peatland drainage to expand crop or pasture areas—releases vast stocks of carbon, while the pre- and post-production stages of fertiliser manufacture, food processing, transport and waste disposal increasingly dominate the overall footprint of agri-food systems. Emission dynamics are shaped by regional patterns of diet, technology adoption and policy ambition. As yields and livestock numbers rise to meet growing demand, emissions within the farm gate have modestly increased, even as improved land-use practices have curbed deforestation in some regions. At the same time, electrification of farm machinery and shifts in energy sources have altered the mix of direct and indirect emissions. Comprehensive mitigation requires integrated approaches spanning precision nutrient management, feed and breeding innovations, energy efficiency, and supply-chain interventions, alongside measures to encourage dietary shifts and reduce food loss. Research continues to refine our understanding of trade-offs between productivity, environmental outcomes and socio-economic resilience in a warming world.

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Greenhouse Gas Emission Dynamics in Agricultural Systems publication trend

The graph below shows the total number of articles in greenhouse gas emission dynamics in agricultural systems across all publications each year (not limited to Nature Index journals).

Technical terms

Greenhouse gas (GHG): Any atmospheric gas that absorbs and emits infrared radiation, contributing to the greenhouse effect.

Farm gate: The boundary defining all on-farm production activities, excluding processing, transport and consumption stages.

Agri-food system: The interconnected network of production, processing, distribution, consumption and waste management of food.

Emission intensity: The quantity of GHG emissions per unit of agricultural output or economic value.

Enteric fermentation: Biological process in ruminants producing methane during digestion.

References

1. Pre- and post-production processes increasingly dominate greenhouse gas emissions from agri-food systems. Earth System Science Data (2022).
2. Emissions of greenhouse gases from energy use in agriculture, forestry and fisheries: 1970–2019. Earth System Science Data (2022).
3. Greenhouse gas emissions intensity of food production systems and its determinants. PLOS ONE (2021).