I was a strict vegetarian for 10 years. Now I'm a sort of sometimes-meat-avoider: my wife and I keep a meatless kitchen but eat whatever when someone serves it to us and sometimes when we're out. As I've writtenbefore, the virtuous identity marker "vegetarian" is less important to me than it used to be. But I still think eating way less meat is the single biggest bit of lifestyle "greening" most Americans could do.
Critics of the food movement's emphasis on organic, smaller-scale and local/regional agriculture tend to point out that feeding the world requires large-scale, conventional farming. But we're already producing more food than we need. The problem is drastic inequalities of access.