Oxygen bottles are not nearly the problem they used to be due to programs in the late 90s and on where companies paid Sherpas (and other climbers) for bringing

Oxygen bottles are not nearly the problem they used to be due to programs in the late 90s and on where companies paid Sherpas (and other climbers) for bringing empties back off the mountain. There's also been a concerted effort to pick up trash starting ~1990 (see: http://en.wikipedia.org/wiki/Earth_Day_20_International_Peace_Climb http://en.wikipedia.org/wiki/Earth_Day_20_International_Peac...)