The Perrito Moreno glacier, Argentina 2008Photography by Klaus ThymannGlaciers burst out of the landscape, snaking between peaks, carving away the dense mountains around. The snowy white surface extends as far as the eye can see, the new layers of snow putting pressure on the cold mass below which compacts it and forms dense ice. The many metres of ice are extremely heavy – often the sheer weight causes such high pressure that the glacier's underbelly melts and the frozen mass flows like...