A huge mass of ice broken off from the Upsala glacier melts on the waters of Lago Argentino, in Parque Nacional Los Glaciares, southwest of Argentina in the Patagonian province of Santa Cruz, March 27, 2007. The Upsala glacier, one of the largest in the southern hemisphere, has a wall of ice of more than 60 meters (197 feet) above the water surface, is 60 km (37 miles) long and has a total surface of 595 square km (232 square miles). According to Argentine scientist Jorge Rabassa, the Patagonian glaciers are being affected by climate change and probably by between 2020 and 2030, most of them will be gone.
REUTERS/ENRIQUE MARCARIAN