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_MG_0191-_petermann_glacier_20090709.jpg
Ice dunes on Petermann Glacier, in remote northwestern Greenland, on Nares Strait, near Canada's Ellesmere Island.  Photographed during a 2009 Greenpeace expedition to investigate the effects of climate change in the Arctic. In 2010 and 2012 Petermann calved ice islands totalling 400 square kilometres.