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Humane Foundation
Topic hub · Climate & Planet

Methane & Livestock Emissions

Livestock methane is the shortest-lived and most tractable major climate forcer. This hub explains enteric fermentation, GWP100 versus GWP*, feed additives, manure lagoons and what dietary shift would actually deliver.

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12
Writers
7
Reading time
60m
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2
Aerial view of an industrial cattle feedlot beside a manure lagoon, with runoff entering an adjacent river.
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The Environmental Impact of Factory Farming: A Science-Backed Guide

Emissions, water pollution, land use and deforestation — what the peer-reviewed evidence says about industrial animal agriculture, and what actually reduces the damage.

By Humane Foundation Editorial · 9 min read

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Frequently asked questions

How much of global emissions come from animal agriculture?
Estimates commonly range from roughly 11% to 20% of global greenhouse gas emissions depending on boundary choices such as land-use change and supply-chain accounting.
Why does methane matter so much?
Methane traps far more heat than CO2 over a 20-year window but breaks down within about a decade, so cutting it lowers near-term warming quickly.

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