EWG's Meat Eater's Guide to Climate Change and Health, demonstrates the benefits, both for health and the environment, of eating more vegetables and less meat.

This infographic comes from ewg.org

Here's the list of foods, in order from best to worst:

Lentils
Tomatoes
2% Milk
Beans
Tofu
Broccoli
Yogurt
Nuts
Peanut Butter
Rice
Potatoes
Eggs
Tuna
Chicken
Turkey
Salmon
Pork
Cheese
Beef
Lamb