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Looking at this chart from a recent paper by Christopher L. Weber and H. Scott Matthews in Environmental Science and Technology, the obvious lessons are that cutting back (through personal choice as well as policy instruments like altered subsidies) on red meat and dairy is important from a climate standpoint. Vegans hoping to leverage climate concerns will lose traction due to chicken, fish, and eggs being in the same ballpark as vegetables and cereals -- though I think non-climate environmental concerns like lagoons of chicken poop and collapsing fisheries could be brought in on those points. More interesting, especially to the 4-to-12-year-old crowd, is the clear climate advantage of sweets over vegetables.