The Environmental Working Group just put out a really great resource called the Meat Eater's Guide to Climate Change and Health. It doesn't tell you not to eat meat, but instead recommends which types of meat and protein are best for your health and the environment. Below is the graphic they use to show the greenhouse gas emissions of twenty common foods. Surprisingly, cheese is listed as the third worst food in terms of environmental impact! Chicken, fish, and eggs are much better (less impactful) sources of protein than cheese, beef, and lamb. To see the graphic up close, as well as the rest of EWG's report, click here.