Livestock and climate
Animal agriculture is responsible for roughly 14–20% of global greenhouse-gas emissions and is the dominant human use of land.
Livestock — the animals raised for meat, dairy, eggs, and leather — drive a substantial share of humanity’s planetary footprint.
The headline figures
- Greenhouse-gas emissions. Estimates typically range from ~14.5% (FAO) to ~20% (more recent analyses that include land-use change) of global anthropogenic emissions. Methane from enteric fermentation is especially potent on short timescales.
- Land use. Livestock occupy, directly or via feed crops, ~80% of all agricultural land — yet provide under 20% of the world’s calories.
- Freshwater. Animal products account for roughly a third of agricultural water use.
- Biodiversity. Conversion of forest and grassland to pasture and feed crops is the leading driver of terrestrial biodiversity loss.
The leverage of food choice
Because animal products are both calorie- and land-inefficient, dietary shifts are among the highest-leverage climate interventions available to individuals. A global shift toward plant-based diets could free land equivalent to the United States, China, the European Union, and Australia combined — land that could be rewilded, reforested, or used for carbon sequestration.
What it doesn’t mean
None of this implies that every farm is equivalent or that small-scale regenerative practices are impossible. But the dominant system — factory farming — is not marginal to the climate story. It is central.