The melting of tropical glaciers

While reading enn.com today, there were several interesting articles about the melting of the tropical glaciers in South America. Yesterday, or the day before a glacier in Peru broke off and fell into a lake causing a 75 ft. tsunami wave that killed at leased three people and destroyed a water processing plant that serves 60,000 locals. The glacier measured 1,640 feet by 656 feet. The cordillera blanca in Peru is the is the largest glacier chain in the tropics. The glaciers are melting at an extremely high rate, and dangering water supply to the arid Peruvian coast, which is home to Lima, that has a population of over 8 million. Quelccaya in southern Peru is the worlds largest tropical ice cap, and is shrinking at a rate of 200 feet per year. Since 1970 the Peruvian glaciers have lost about 22 percent of their total glacier area. Reports show similar data in other Andean countries such as: Ecuador, Bolivia, Colombia and Venezuela. Global warming and rising temperatures are the culprits here. If the glaciers continue to melt at this speed, it means disaster for countries such as Peru and Ecuador, where the majority of these countries populations live on the arid coast and cannot receive the water from the glaciers. It also means disaster for these countries agriculture. What will they do when all the glaciers dry up, and there is no fresh water?