Shoes are necessary gear for most runners. When you're done with them, they contribute to the amount of trash heaped into landfills every year. While running is a relatively green sport, the discarding of shoes is one area in which we can do better. Luckily, there are environmentally and socially responsible ways to get rid of old running shoes, such as Nike's Reuse-A-Shoe program and One World Running's shoe redistribution program. See how you can recycle your shoes.