Meat, take a back seat. Today, we're packing in the protein thanks to vegetarian sources, like beans, grains, nuts and seeds. Not only are these protein sources good for the body, but they're good for our environment, too. So check yourself, Kermit. 'Cause it's easier being green than you've been leading on. Need proof? We've got it in these 20 protein-packed veggie salads.