Chris Sharma returns to his childhood tree climbing roots on a grand scale. In this video, he puts up a first free ascent on one of Northern California's giant redwoods. This isn't your typical backyard oak tree ladder. The massive ribs of the bark are more akin to tuffas, and Sharma calls it "proper hard climbing." Bonus: Red Bull is donating $.10 per video view up to $10,000 to benefit redwood tree research.