The Khumbu Glacier, popular climbing route to the summit of Mt. Everest, has retreated over 3 miles (5 km) since 1953. The Himalayan region overall has warmed by about 1.8°F (1°C) since the 1970s.
Reference: Shrestha, A.B., C.P. Wake, P.A. Mayewski, J.E. Dibb, 1999. Maximum temperature trends in the Himalaya and its vicinity: An analysis based on temperature records from Nepal for the period 1971-94. Journal of Climate, 12: 2775-2787.
UNEP, 2002. Impact of global warming on mountain areas confirmed by UNEP-backed mountaineers. GRID-Arendel News, United Nationas Environmental Program. June 5, 2002. http://www.grida.no/inf/news/news02/news41.htm