Raising animals for food requires massive amounts of land, food, energy, and water, and the byproducts of animal agriculture pollute our air and waterways. The Environmental Protection Agency reports that roughly 80 percent of ammonia emissions in the U.S. come from animal waste and that the agricultural runoff caused by the three trillion pounds of animal waste produced each year is the number one source of pollution in our waterways. Moo. Reduce your meat intake by embracing programs like “meatless Mondays” or “weekday vegetarianism.” When you do buy meat, look for free range USDA Certified Organic options that typically come from more responsibly managed farms.