The ice fields in the Himalayan mountains have receded dramatically from their breadth and depth in the 1980s, according to the Australian environmentalist.

FORBES: 500 Million People Will Be Displaced By Glaciers Melting In Greenland And The Himalayas

Purves is very concerned about the glaciers in the Himalayan mountains that are the main source of water for irrigation and drinking in China and India, well over 2 billion people.

FORBES: 500 Million People Will Be Displaced By Glaciers Melting In Greenland And The Himalayas