According to the report, as much as 22% of greenhouse emissions are from agriculture -- a figure similar to that of industry and, quite surprisingly, more than that of transport. Livestock production, which includes transport of livestock and feed, accounts for nearly 80% of these emissions.
Put into perspective, a kilo (2.2 pounds) of beef generates the equivalent of 36.4 kilos (80.08 pounds) of carbon dioxide, more than the equivalent of driving for three hours while leaving all the lights on back home.
Some quotes from the paper:
More can be found here.
"Assuming a 40-percent increase in global population by 2050 and no advance in livestock-related greenhouse-gas reduction practices, global meat consumption would have to fall to an average of 90 grammes per day just to stabilise emissions in this sector."
"A substantial contract in meat consumption in high-income countries should benefit health, mainly by reducing the risk of ... heart disease... obesity, colorectal cancer and, perhaps some other cancers. An increase in the consumption of animal products in low-intake populations, towards the proposed global mean figure, should also benefit health."