Recycle old sneakers

(picture via nikereuseashoe.com)

You can recycle your old sneakers by donating them to Nike's Reuse-A-Shoe program, which collects used sneakers (any brand, not just Nike) and recycles them to create a material dubbed Nike Grind, which is then used to build sports surfaces, such as basketball courts, tennis courts, tracks, etc.  Find a drop-off location here.  If no location near you, you can also mail the shoes directly to Nike (on your dime, unfortunately).  If you are involved with a non-profit or other group interested in organizing a Reuse-A-Shoe drive, APPLY HERE.

Remember, you can donate any worn-out sneaker (doesn't have to be Nike).