I'm gonna make a bold statement.
You cannot be green unless you avoid the consumption of meat.
Those of you who know me, understand that I've been a vegetarian for over two decades. My reasons are ethical, but my decision to avoid meat for all these years accords with my personal belief that the environment deserves our protection and not our continued exploitation for our personal appetites.
For more evidence supporting my personal view, look at this article and the links found therein.