The #1 best protein for your health and the environment (and the worst to avoid)

If you’ve ever found yourself arguing about whether eating meat is healthy for you and the planet and, if so, which meat to eat, you now have some answers. The Environmental Working Group (EWG), which brought us the “Dirty Dozen,” a list of the 12 most pesticide-ridden fruits and vegetables, released a report today showcasing the carbon footprint of 20 conventionally grown popular protein sources, from lentils to lamb.

To come up with the carbon impact, the EWG looked at the food’s full “lifecycle”—including the water and fertilizer to grow feed crops, transportation of the food and even the amount of food that’s wasted.