Thanksgiving is all about food. But did you know that 40 percent of all food in the United States goes to waste every year? That's according to this research paper published by the Natural Resources Defense Council. With this stunning fact in mind, Greenblue.org's Kelly Cramer has written an excellent guide to avoiding food waste this Thanksgiving. Check it out here. The hints include everything from starting backyard composting to saving vegetable scraps to make veggie broth later.