The Guardian reports:

The melting of Himalayan glaciers has doubled since the turn of the century, with more than a quarter of all ice lost over the last four decades, scientists have revealed. The accelerating losses indicate a “devastating” future for the region, upon which a billion people depend for regular water.

The scientists combined declassified US spy satellite images from the mid-1970s with modern satellite data to create the first detailed, four-decade record of ice along the 2,000km (1,200-mile) mountain chain.

The analysis shows that 8bn tonnes of ice are being lost every year and not replaced by snow, with the lower level glaciers shrinking in height by 5 meters annually. The study shows that only global heating caused by human activities can explain the heavy melting. In previous work, local weather and the impact of air pollution had complicated the picture.

Joshua Maurer, from Columbia University’s Lamont-Doherty Earth observatory, who led the new research, said: “This is the clearest picture yet of how fast Himalayan glaciers are melting since 1975, and why.” The research is published in the journal Science Advances. [Continue reading…]

Reuters reports:

Hotels in Chennai are rationing water for guests amid searing heat while companies limit showers as the city of 4.6 million faces its worst shortage in years.

All four reservoirs that supply Chennai, known as the Detroit of South Asia for its flourishing automobile industry, have run dry this summer, largely because of poor monsoon rains last year.

Chennai is one of 21 cities that a government think-tank warned last year could run out of ground water by 2020. This year’s monsoon is delayed, further compounding problems across a swath of western and central India. [Continue reading…]