The last frontier: the climbers conquering Mount Everest without oxygen
by Mark Jenkins from Environment | The Guardian on (#1GVGV)
Among elite mountain climbers, summiting Everest sans oxygen has become the latest challenge in an already grueling journey
Another climbing season has finished on Mount Everest, with the inevitable tales of tragedy and triumph.
Since 2000, an average of seven people a year have died on Everest. The past two years were especially grim: 19 people were killed by an earthquake-triggered avalanche in 2015, and 16 died in 2014.
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