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The Gangotri glacier has retreated 0.15 sq km between 2007 and 2016. Environment Minister Mr Harsh Vardhan in a written reply said the melting of Gangotri glacier has been studied by the Indian Space Research Organisation (ISRO) by taking Survey of India maps of 1962 as the base. He said that the area of the Gangotri glacier was estimated to be 224.42 sq km from the maps of 1962, while from 1990 onwards satellite data was used to monitor the Himalayan glaciers.