"Lamb, beef and cheese generate the most greenhouse gases of 20 popular meat, fish, dairy and vegetable proteins, according to a new study from the Environmental Working Group. The Meat Eater's Guide, released by the Washington-based environmental research firm, used a cradle-to-grave life-cycle assessment to determine each food's rank, including the amount of fertilizer used to grow animal feed, as well as data on each food's processing, transportation and disposal."

Susan Carpenter reports for the Los Angeles Times July 17, 2011. [2]