New Delhi, Feb 5: Scientists have determined that glaciers that serve as water sources on the Qinghai-Tibet plateau in Southwestern China are melting at a "worrisome speed", having receded 196 square km over the past 40 years.
The decline is equal to about one-fourth of the size of New York City.
According to Xin Yuanhong, senior engineer in charge of a three-year field study of glaciers in the region, glaciers at the headwaters of the Yangtze, China's longest river, cover 1,051 square km, down from 1,247 square km in 1971.
"The reduction means more than 989 million cubic meters of water melted away," said Xin, whose team surveyed the glaciers between June 2005 and August 2008.