Did you know that more greenhouse gases are produced worldwide by animal farming than by transportation? Well, it’s true! Some types of meat, though, have more of a negative impact on the environment than others. In fact, the Environmental Working Group recently looked at the environmental impact of 20 conventionally grown protein sources—including beans, dairy, produce, meat and poultry—and determined which are the best and worst choices. The top offenders (as in ones you should limit) are: lamb, beef, cheese and pork.