Eliminate Food Waste

Another way people can recycle their leftover food is through vermicomposting. This process uses earthworms to turn organic wastes into high-quality compost.

It may sound icky, but Sophie says the waste worms produce is the most nutritious thing you can put in your yard.

To start vermicomposting, you'll need a bin, bedding and a few thousand worms, which you can order on the Internet. "The waste goes in there, and the worms crawl up, devour the waste, and then they're really happy," Sophie says.

Find out more about composting from Sophie's book Gorgeously Green .