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7 ultra-green extreme sports

By: Shea Gunther on Jan. 11, 2010, 12:30 p.m.
Free Solo Climbing

Photo: billaday/Flickr

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Free solo climbing

Free solo climbing is easily the most dangerous of the greener extreme sports — one slip, one mistake and you're dead or maimed. Free solo climbers ascend without ropes, harnesses or other protective gear to protect them. The only equipment needed to free solo is a pair of climbing shoes — and the mental bravado to risk it all in the pursuit of a fantastic view.

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