How livestock emissions are counted

The headline range is not a dodge. It is the accounting problem.

The question this tool answers

Animal agriculture is a climate problem with two different scales. At the sector scale, studies place livestock and animal-based food systems at roughly 11 to 20% of human greenhouse-gas emissions, depending on what is counted. At the product scale, the contrast is sharper: a kilogram of beef can carry tens of kilograms of CO₂-equivalent emissions, while tofu and beans are a few kilograms or less.

This dashboard leads with the product comparison because it is the part most readers can hold in their heads. It keeps the sector range beside it because policy still happens at the sector scale.

Why the headline number varies

The familiar FAO number is about 14.5% of global greenhouse-gas emissions for livestock supply chains. That estimate comes from FAO's Global Livestock Environmental Assessment Model, or GLEAM. Other summaries, including IPCC and Our World in Data explainers, can land lower or higher depending on boundaries: whether land-use change is included, whether food transport and retail are counted, which warming metric is used for methane, and whether the denominator is all human emissions or only food-system emissions.

That is why this page says 11 to 20%. The spread is not because nobody knows whether cows emit methane. It is because “animal agriculture” can mean farm-gate emissions only, full supply chains, land cleared for pasture and feed, or a broader food-system footprint.

What the product bars show

The product ladder uses Joseph Poore and Thomas Nemecek's 2018 Science meta-analysis, one of the canonical global life-cycle assessments of food. It compares emissions per kilogram of food across thousands of farms, processing systems, and regions. The bars are cradle-to-farm-gate averages, not a receipt-level calculator for one steak or one block of tofu.

The pattern is robust even when exact numbers change: ruminant meat is high because cattle and sheep produce methane during digestion, need feed and land, and often have land-use emissions attached. Plant proteins sit low because they skip the animal conversion step.

What is live

Most numbers on this page are reference statistics. FAO, IPCC, Climate Watch, and Poore & Nemecek do not publish minute-by-minute livestock-emissions feeds. We update those values when reports update.

The live signal is atmospheric methane from NOAA's Global Monitoring Laboratory, pulled through the permafrost and methane monitor. It is not a livestock-only meter. Agriculture is a major human methane source, but fossil fuels, waste, wetlands, and fires also contribute. The stripes answer a narrower question: is methane in the atmosphere still rising?

What the map does not prove

The Methane Pledge map shows political coverage: which governments have signed a voluntary target to cut methane 30% below 2020 levels by 2030. It does not prove delivery. A country can sign and still lag; a country can be outside the pledge and still have methane policies. The map belongs below the product and methane panels because it is policy context, not the core climate footprint.

Further reading

• FAO GLEAM — global livestock emissions modelling. fao.org/gleam
• FAOSTAT emissions — agriculture emissions data. FAOSTAT
• IPCC AR6 WG3 — mitigation report, agriculture and land chapters. ipcc.ch/report/ar6/wg3
• Poore & Nemecek 2018 — product-level food life-cycle meta-analysis. Science
• Our World in Data — accessible summaries of food footprints. ourworldindata.org
• NOAA GML methane — global atmospheric CH₄ measurements. gml.noaa.gov

Credits

This dashboard depends on FAO livestock modelling, IPCC assessment work, Climate Watch inventory curation, Poore & Nemecek's food life-cycle synthesis, and NOAA atmospheric methane measurements. It is climate-accounting context, not dietary advice or a country blame index.