The impact of climate change on glaciers has been well documented. From Alaska to Europe, Antarctica to Siberia, glaciers are in recession the world over. Forty-six gigatons of ice from Alaskan glaciers was lost on average for each year from 2003 to 2010, according to Nasa, while those in Asia are losing acres of coverage annually. All glaciers situated near Mount Everest are in retreat, including the Rongbuk glacier. Explored by George Mallory in 1921, it