Tibet's earthquake of magnitude 6.8 that killed 126 and damaged four water reservoirs this week highlights the risks from a hydropower building spree by Asian giants China and India in one of the world's most remote,

Rescuers dig through rubble for survivors after 6.8 magnitude earthquake in Tibet. Emergency workers built tent cities and provided hot meals for those affected by the earthquake, as rescuers dug through rubble in an effort to find those trapped.