In this photograph taken on May 23, 2013 unidentified mountaineers look out from the summit of Mount Everest. Nepal marked 60 years since the first ascent of Everest May 29, celebrating the summiteers whose success has bred an industry that many climbers now fear is ruining the world's highest peak. AFP PHOTO/Tshering SHERPA (Photo credit should read TSHERING SHERPA/AFP/Getty Images)
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