Other summaries of this article have noted that reducing GHG emissions from American agriculture by 28% is equivalent to reducing total American emissions by 2.

Other summaries of this article have noted that reducing GHG emissions from American agriculture by 28% is equivalent to reducing total American emissions by 2.6%. (Though, as other HN commenters have noted, just converting all land area devoted to animal agriculture to direct production of human-edible foods is unrealistic; I'd expect somewhat larger benefits in a realistic scenario where a lot of that land goes idle. But all agriculture together accounts for only 9% of American emissions to begin with.) I personally don't eat beef, and have ethical concerns about animal treatment in food production systems, but people whose only source of information is "Cowspiracy" badly overestimate how large a proportion of American GHG emissions stem from animal agriculture.