The Environmental Protection Agency (EPA) reports that if we composted 100 percent of our food scraps, we could prevent the equivalent of 20 million metric tons of carbon dioxide emissions each year, the equivalent of more than 3.8 million vehicles greenhouse gas emissions. Composting is one of the easiest and least expensive ways you can reduce your household waste and improve your garden, and using worms in your compost bin will provide you with the best compost available.