Looking out of a tent door into a world of snow and vanishing hopes. ~George Mallory

. . .There is nothing to complain of. . .we had a gorgeous day for the climb, almost windless and brilliantly fine, yet we were unable to get to the summit. So we have no excuse - we have been beaten in fair fight; beaten by the height of the mountain, and by our own shortness of breath. But the fight was worth it, worth it every time, and we shall cherish the privilege of defeat by the world's greatest mountain.

The first ascent of Everest came at a time when humanity needed relief from two world wars. It was a unifying and inspiring event, signifying the drive to reach our greatest potential.

The alpine environment is very delicate. I've been able to see change in the mountains in the 20 years that I've been climbing full-time. Glaciers have receded. The tree-line is changing. That's very rapid to see nature changing in a 20-year period.

Specifically choose not to take a GPS. Just create a challenge. You can climb Everest or walk across Antarctica with minimal gear and still have that sense of adventure. But in terms of exploration, Google Earth has this world mapped down to the square foot.

If you compare Everest photographs in 1953 with its current state, things are melting. I imagine if I were a golfer in Indiana, I'd be hard-pressed to believe in climate change because nothing's going on there. But when you're up in the mountains and seeing the glaciers melt away, it's an obvious physical manifestation of a warming planet.