Warmer air is thinning most of the vast mountain range’s glaciers, known as the Third Pole because they contain so much ice. The melting could have far-reaching consequences for flood risk and for water security for a billion people who rely on meltwater for their survival.
In a rare journey down the length of the Indus River, a filmmaker and environmental activists survey damage done to Pakistan's main water artery and meet the people who live on its ancient banks.
Melting ice is crucial to the thirsty Indus River region. But now the flow is projected to decline, posing risks for agriculture and a growing population.
From the American West to China, Australia to India, some of the world's most important rivers have been drained dry for agriculture, industry, and drinking water.
