Naked volunteers pose for the US photographer Spencer Tunick in the ice-cold Swiss glacier of Aletsch, the largest in the Alps, as bakground for an environmental campaign about global warming 18 August 2007 near the mountain resort of Bettmeralp. The campaign organised by Greenpeace is aimed at drawing attention to melting Alpine glaciers, a clear sign of global warming and man-made climate change according to the organisation. AFP PHOTO / FABRICE COFFRINI
