In this photo taken in October 2009 and released by WWF, Imza Lake lies near the foothills of Mount Everest, near legendary mountaineer Apa Sherpa's old home in Nepal. Apa used to circle along a track skirting the water's edge but the trails have long since disappeared underwater. Apa, who has scaled the world's highest mountain a record 21 times, is on a quest to draw attention to the danger of more devastating floods as glacial melt caused by climate change fills mountain lakes to the bursting point. (AP Photo/WWF, Steve Morgon) EDITORIAL USE ONLY

Associated Press
In this photo taken in October 2009 and released by WWF, Imza Lake lies near the foothills of Mount Everest, near legendary mountaineer Apa Sherpa's old home in Nepal. Apa used to circle along a track skirting the water's edge but the trails have long since disappeared underwater. Apa, who has scaled the world's highest mountain a record 21 times, is on a quest to draw attention to the danger of more devastating floods as glacial melt caused by climate change fills mountain lakes to the bursting point. (AP Photo/WWF, Steve Morgon) EDITORIAL USE ONLY
In this photo taken in October 2009 and released by WWF, Imza Lake lies near the foothills of Mount Everest, near legendary mountaineer Apa Sherpa's old home in Nepal. Apa used to circle along a track skirting the water's edge but the trails have long since disappeared underwater. Apa, who has scaled the world's highest mountain a record 21 times, is on a quest to draw attention to the danger of more devastating floods as glacial melt caused by climate change fills mountain lakes to the bursting point. (AP Photo/WWF, Steve Morgon) EDITORIAL USE ONLY
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