Hikers take a rest with a view on the Aletsch Glacier at the Eggishornn summit in Fiesch, Switzerland, August 12, 2015. One of Europe's biggest glaciers, the Great Aletsch coils 23 km (14 miles) through the Swiss Alps - and yet this mighty river of ice could almost vanish in the lifetimes of people born today because of climate change. The glacier, 900 metres (2,950 feet) thick at one point, has retreated about 3 km (1.9 miles) since 1870 and that pace is quickening. REUTERS/Denis Balibouse
