This article raises some great points. For example, in some areas, farming dairy products is less of a strain on the environment than agriculture. Also, assessing environmental effects depends on how much people buy locally.

Quoted: As a longtime vegetarian, I've always been confident that my diet is better for the planet than that of your typical carnivore. But a vegan pal of mine says I could be doing a lot more, by rejecting all animal products—no eggs, no milk, no cheese. Is veganism really that much better for the environment?