I know Earth Day [1] was last week but that does not mean you need to stop being green. The thing with sneakers is that not only are they expensive, but in order to get the most out of them you should get a new pair every few months. That's a lot of sneakers in landfills. Brooks Running gives some great tips on how to get the most out of your sneakers [2]. Some of these you may already do, and some you may not have thought of. They are [3]:

• Phase One: Your brand-new running shoes
  First, enjoy your brand-new running shoes for 300 miles of pure running joy. Use their cushioning and resiliency to give you the perfect ride as you run day after day.
• Phase Two: Transition to casual street shoes
  Once they pass the 300-mile mark, those trusty running shoes make great casual street-wear. Pair them with jeans for a trip to the grocery store, an outing with your dog, or a day at the park.

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• Phase Three: Transition to work-around-the-house shoes
  Of course, even casual street shoes begin to show signs of age over time. Offer them a change of pace by promoting them to lawn mowing, painting, or gardening shoes.
• Phase Four: Retirement from active work life
  You may think the next best place for your well-worn, around-the-house work shoes is the trash. But wait one minute! If they're still in good shape, those shoes have more life left to give. They can help someone in need when you donate them to charity. Find a local drop-off center in your community or ship them to a national organization, like Soles4Souls [4] or One World Running [5].
• Phase Five: A final resting spot
  After years of use and wear, those running shoes are ready for their final resting spot in a local landfill. [At Brooks], if they have a BioMoGo [6] midsole, parts of the shoe will be returned to the earth as reusable byproducts that can help grow trees and plants.

Source [7]