(01 of15)
Open Image ModalThis Tuesday, Feb. 22, 2011 photo shows a view of Perito Moreno Glacier in Los Glaciares National Park in Argentina. Perito Moreno is among the most accessible large glaciers and remains relatively intact even as glaciers all over Patagonia have been retreating in the past few decades. (AP Photo/Ian James) (credit:AP)
(02 of15)
Open Image ModalIn this July 19, 2011 file photo, pools of melted ice form atop Jakobshavn Glacier, near the edge of the vast Greenland ice sheet. Greenland's glaciers are hemorrhaging ice at an increasingly faster rate, but it's not the breakneck pace scientists once feared, a new study says.. (AP Photo/Brennan Linsley, File) (credit:AP)
(03 of15)
Open Image Modal(FILES) View of the Perito Moreno glacier in southern Argentina on February 28, 2008. For the first time the glacier will rupture in winter, probably due to the climate change, Carlos Corvalan, Director of Los Glaciares National Park said on July 7, 2008. (DANIEL GARCIA/AFP/Getty Images) (credit:Getty Images)
(04 of15)
Open Image ModalView of the south wall of the Perito Moreno glacier February 28, 2008 in the Park and National Reservation Los Glaciares, an ecotourism destination in Patagonia, Argentina, declared by the UNESCO as Natural World Heritage Site. The glacier Perito Moreno, in the province of Santa Cruz, is one of the most significant natural attractions of Argentina 30km (20 miles) long and with a total surface of 257 km2 (160 square miles). The magnitude of this mass of ice, seems to float on lake Argentino some 70 meters (230 feet) above the water surface. (DANIEL GARCIA/AFP/Getty Images) (credit:Getty Images)
(05 of15)
Open Image ModalThis May 30, 2012 image provided by Ian Joughin shows an iceberg in or just outside the Ilulissat fjord, that likely calved from Jakobshavn Isbrae, the fastest glacier in west Greenland. Polar ice sheets are now melting three times faster than in the 1990s, but so far that's added just less than half an inch to already rising global sea levels, a new giant scientific study says. While the amount of sea level rise isn't as bad as some earlier worst case scenarios, the acceleration of the melting, especially in Greenland, has ice scientists worried. (AP Photo/Ian Joughin) (credit:AP)
(06 of15)
Open Image ModalIn this picture taken Wednesday, July 27, 2011, Hindu pilgrims make their way to the Amarnath cave shrine over a glacier near Panchtarni, 150 kilometers (93 miles) from Srinagar, India. At least half a million devotees make the pilgrimage to the icy cave which lies 13,500 feet (4,115 meters) above sea level in Indian-controlled Kashmir amid tight security. Hindus worship a stalagmite inside the cave as an incarnation of the Lord Shiva, the Hindu god of destruction and regeneration. (AP Photo/Altaf Qadri) (credit:AP)
(07 of15)
Open Image ModalPicture taken on September 21, 2012 near Chamonix of the 'Mer de Glace', France longest glacier, visited each year by more than 500.000 tourists. (JEAN-PIERRE CLATOT/AFP/GettyImages) (credit:Getty Images)
(08 of15)
Open Image ModalThis 2009 photo released by Extreme Ice Survey shows Birthday Canyon in Greenland furing the filming of "Chasing Ice." The film, about climate change, follows National Geographic photographer James Balog across the Arctic as he deploys revolutionary time-lapse cameras designed to capture a multi-year record of the world's changing glaciers. (AP Photo/Extreme Ice Survey, James Balog) (credit:AP)
(09 of15)
Open Image ModalA Picture taken on August 31, 2012 shows the Bossons glacier in the fog, near Chamonix-Mont-Blanc, French Alps, where will take place the Mont-Blanc North Face Ultra-Trail, a 168km race around the Mont Blanc crossing France, Italy and Swiss. The Ultra-Trail du Mont-Blanc (UTMB) is a mountain ultramarathon with numerous passages in high altitude (>2500m), in difficult weather conditions (night, wind, cold, rain or snow). (JEAN-PIERRE CLATOT/AFP/GettyImages) (credit:Getty Images)
(10 of15)
Open Image ModalA close-up view of Mendenhall Glacier, on a sunny day, on Saturday, June 23, 2012, in Juneau, Alaska. (AP Photo/Becky Bohrer) (credit:AP)
(11 of15)
Open Image ModalIn this picture taken Aug. 25, 2012, a flock of alpine sheep walk on a cliff path on the way from summer grazing high above the Aletschgletscher glacier, background, down to Belalp in the canton of Valais, during the "Schaeferwochenende" (Shepherd's Weekend) in Belalp near Blatten, Switzerland. (AP Photo/Keystone/Jean-Christophe Bott) (credit:AP)
(12 of15)
Open Image ModalIce chunks sit in Mendenhall Lake, in front of the Mendenhall Glacier, on Saturday, June 23, 2012, in Juneau, Alaska. (AP Photo/Becky Bohrer) (credit:AP)
(13 of15)
Open Image ModalSpray from the heavily flowing Nugget Falls carries in front of the Mendenhall Glacier on Saturday, June 23, 2012, in Juneau, Alaska. (AP Photo/Becky Bohrer) (credit:AP)
(14 of15)
Open Image ModalThis photo provided by Bridger-Teton National Forest Avalanche Center shows a growth in snow-field volume in the Teton range of the Cody Bowl this fall over previous years. Scientists who monitor the effects of global warming are watching glaciers shrink all over the world but this year could go down as an exception in parts of the Rocky Mountains. (AP Photo/Bridger-Teton National Forest Avalanche Center, Bob Comey) (credit:AP)
(15 of15)
Open Image ModalThe tail end of the Bossons Glacier in Mont Blanc chain is pictured in the French Alps, on December 26, 2012 in Chamonix. (JEAN-PIERRE CLATOT/AFP/Getty Images) (credit:Getty Images)