Livestock Emissions Explained: Key Numbers, Sources, and Solutions

The scale of livestock emissions

Global livestock production generates around 7.1 gigatonnes of CO₂-equivalent emissions per year, accounting for 14.5% of all human-caused greenhouse gas (GHG) emissions. This estimate aligns with earlier assessments, though newer data and improved methods make direct comparisons difficult.

Among all livestock, cattle—raised for both beef and dairy, as well as by-products like manure and draft power—are the largest contributors, responsible for about 65% of total sector emissions.

Where emissions come from

Livestock emissions mainly originate from a few key activities:

• Feed production and processing (including land-use change): 45%
• Enteric fermentation (mainly from ruminants like cows): 39%
• Manure storage and processing: 10%
• Processing and transport of animal products: remaining share

Across all stages, fossil fuel use in supply chains contributes about 20% of total emissions.

Emissions by product

Certain animal products have a much larger climate impact than others:

• Beef: 41% of total livestock emissions
• Cow’s milk: 20%
• Pig meat: 9%
• Buffalo milk and meat: 8%
• Chicken meat and eggs: 8%
• Small ruminant products (e.g., sheep and goat): 6%

Other poultry and non-edible outputs make up the remaining share.

Emission intensity differences

Emission intensity—how much GHG is produced per unit of food—varies widely:

• Beef: ~300 kg CO₂-eq per kg of protein (highest)
• Sheep and goat meat/milk: 112–165 kg CO₂-eq/kg
• Milk, poultry, and pork: generally below 100 kg CO₂-eq/kg

Even within the same product category, emissions can differ significantly depending on farming practices and regional conditions.

Emissions by gas type

Livestock emissions consist of three main greenhouse gases:

• Methane (CH₄): 44%
• Nitrous oxide (N₂O): 29%
• Carbon dioxide (CO₂): 27%

In absolute terms, livestock supply chains emit:

• CO₂: contributing about 5% of global human-caused CO₂ emissions
• CH₄: about 44% of global methane emissions
• N₂O: about 53% of global nitrous oxide emissions

How emissions can be reduced

Improving efficiency

There is a strong link between production efficiency and emissions. Losses of nitrogen, energy, and organic matter translate directly into higher emissions. Improving efficiency at both animal and herd levels is one of the most effective ways to reduce impact.

Key mitigation strategies

For cattle and other ruminants

• Better feed quality and feeding techniques to reduce methane
• Improved breeding and animal health to increase productivity per animal
• More efficient manure management to recover nutrients and energy
• Sustainable grazing practices to boost productivity and store carbon in soils

For poultry and pigs

• Precision feeding to minimize waste and emissions
• Enhanced breeding and animal health
• Switching to lower-impact feed sources
• Using cleaner, more efficient energy in production systems

Mitigation potential

There is significant variation in how livestock is produced globally, creating an “emission intensity gap.” By narrowing this gap—adopting best practices more widely—emissions could be reduced by up to 30%.

Additionally, grassland carbon sequestration could remove roughly 0.6 gigatonnes of CO₂-equivalent per year, further supporting climate goals.

Policy actions that matter

Effective emission reduction requires coordinated policy support:

• Extension services and training to spread best practices
• Research and development to improve technologies and adapt them locally
• Financial incentives, such as subsidies or carbon markets
• Transparency tools, like labeling systems showing product emissions
• Awareness campaigns to highlight livestock’s role in climate change
• National mitigation strategies (NAMAs) tailored to local conditions
• International agreements to ensure shared responsibility across sectors

Bottom line

Livestock plays a major role in global greenhouse gas emissions, but it also offers substantial opportunities for reduction. By improving efficiency, adopting better technologies, and aligning policy support, the sector can significantly lower its climate impact while maintaining productivity.