Waste Less Food
Americans waste 96 billion pounds of food each year. According to the USDA's, "Estimating and Addressing America's Food Losses," nourishing food -- and lots of it -- is going down the garbage disposal. In the past decade or so, restaurants have been exaserbating the problem, too. Plates are bigger, portions are enormous and you can super size just about anything. But this can all be avoided.
The next time you eat out, bring home half of your entree and eat it the next day. When you cook, make smaller portions. Eat everything you prepare, and shop with conservation instead of abundance in mind.