Eat Less of Everything

If this were as simple as it sounds, we wouldn't have an obesity problem in this country. Americans' portion sizes keep growing, and so do our waistlines. No matter how green our food is, each bite takes a toll on the environment through production, packaging, and transport. So, cutting down -- by preparing and ordering less, not just tossing out half of what's on your plate -- automatically reduces your carbon footprint, not to mention your caloric intake. And if you have children, you have even more reason to cut down on food intake since children's obesity is a rising epidemic nationwide.