Livestock cause 51 percent of greenhouse gas emissions

Livestock cause 51 percent of greenhouse gas emissions
	MISLEADING
	"Livestock and their byproducts account for at least 51 percent of global greenhouse gas emissions, more than all transportation, industry and energy combined."
Domain	Science & Environment
Tactic	Statistical & Evidentiary Distortion;
Era	Current
First seen	2009
Origin	A 2009 article for the Worldwatch Institute by Robert Goodland and Jeff Anhang, popularized by the 2014 documentary Cowspiracy and animal advocacy campaigns
Last reviewed	2026-10-27
	Further reading: books on Science & Environment

The claim that livestock cause 51 percent of greenhouse gas emissions has been widely shared by animal welfare and environmental advocates, especially after the 2014 documentary Cowspiracy. It comes from a 2009 article published by the Worldwatch Institute, an environmental think tank, which recalculated livestock's share of emissions using unconventional methods. Mainstream scientific estimates, including those of the UN Food and Agriculture Organization (FAO), put livestock's share at roughly 12 to 15 percent of human-caused greenhouse gas emissions. That is a large share, comparable to all transport, and reducing it matters. But the 51 percent figure is an outlier that relies on methods most researchers reject.

The claim

The figure is typically cited to argue that animal agriculture is the leading cause of climate change, and that eating less meat is the most important action individuals can take, more important than changes in energy or transport.

Origin

In 2006 the FAO report Livestock's Long Shadow estimated that livestock accounted for 18 percent of global greenhouse gas emissions, a figure that attracted wide attention. In 2009 Robert Goodland, a former environmental adviser at the World Bank, and Jeff Anhang, a World Bank researcher, published "Livestock and Climate Change" in Worldwatch's magazine, arguing that the FAO had greatly underestimated the share. They concluded that livestock accounted for at least 51 percent. The article was not peer reviewed in a scientific journal. The documentary Cowspiracy later featured the figure prominently.

What the evidence shows

The 51 percent figure departed from standard practice in several ways:

Animal breathing. It counted carbon dioxide exhaled by livestock as an emission. Standard accounting does not, because the carbon in animal breath comes from plants that recently absorbed it from the atmosphere; it is part of a short cycle, unlike carbon from fossil fuels.
Methane timescale. It measured methane's warming effect over 20 years instead of the conventional 100 years, which greatly increases methane's weight relative to carbon dioxide. Both timescales have uses, but switching for one sector while comparing it with totals calculated differently distorts the comparison.
Land use. It attributed to livestock a large amount of "forgone" carbon from land that could have been forested, an approach not applied to other sectors.
Inconsistent totals. Adding these elements to the livestock figure without adjusting the global total in the same way inflated livestock's share.

FAO's later work, using a detailed life-cycle model, estimated in 2013 that livestock supply chains accounted for about 14.5 percent of human-caused emissions. An updated FAO assessment in 2023 estimated about 12 percent. Other independent studies give similar ranges. Some researchers argue that food systems as a whole, including crops, land clearing, processing and transport, account for roughly a quarter to a third of emissions, but that is a different measure.

The 2006 FAO figure itself was criticized, by scientist Frank Mitloehner among others, for comparing full life-cycle livestock emissions with only the direct exhaust emissions of transport; FAO acknowledged the problem.

Why it persists

The 51 percent figure is striking, easy to remember and supports a clear message. It has been repeated in advocacy materials, social media and documentaries, often without its origin. Because livestock emissions really are large, the exaggeration can seem plausible. Its spread shows that misleading statistics are not limited to one side of the climate debate.

Lessons for readers

Check whether a dramatic statistic comes from peer-reviewed research or an advocacy publication.
Ask whether all sectors were measured the same way.
A real problem does not need exaggeration; inflated figures can undermine credibility.
Look for consensus estimates from major scientific bodies.
Be equally skeptical of statistics that support causes you agree with.

Sources

Robert Goodland and Jeff Anhang, "Livestock and Climate Change," World Watch (November/December 2009).
Henning Steinfeld et al., Livestock's Long Shadow: Environmental Issues and Options (FAO, 2006).
P. J. Gerber et al., Tackling Climate Change Through Livestock (FAO, 2013).
Food and Agriculture Organization of the United Nations, Pathways towards lower emissions (2023).