Green. It's something most of us know how to do. We screw in our energy-efficient light bulbs, consume organic food, install solar panels on our roofs, and lug around reusable cloth grocery bags. But green is increasingly giving way to its newer and hipper neighbor: Blue.

Simply put, blue is all about putting back more into the environment than you initially took from it in the first place. And Puma is trying to do just that. The website Ecouterre reports the German sports clothing manufacturer has embraced a growing trend: "Cradle-to-Cradle" design. Puma has developed a line of biodegradable sports clothes that can be buried in your backyard garden or even thrown into a compost heap.

And we don't need the Sierra Club to clue us in on the obvious environmental benefits of wearing compostable (rather than just recyclable) clothing. Admit it, haven't you always wanted to plant your used gym shorts or post-workout yoga pants?

Puma isn't the only sportswear company jumping on the sustainable bandwagon. New Balance has recently introduced a sneaker made from 95 percent post-consumer recycled plastic bottles. The recycled fabric, called Eco-fi, is made from an average of eight recycled plastic bottles per pair.

But if you do decide to go with Pumas, you'll have new reason to tell your friends to lay off of your blue suede shoes.

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