via Treehugger:

According the the WorldWatch Institute (and an old post of our own) livestock contribute 18% of global greenhouse gas (GHG) emissions, even higher than the GHG emissions from transportation. As part of this figure they produce 37% of methane, which has more than 20 times the global warming potential of carbon dioxide. And if that weren’t enough to be concerned about, their manure emits nitrous oxide, 65% of world totals. WorldWatch also point out that in the United States, 70% of all anti-microbial drugs are now given to livestock. (…)

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