Kathmandu, May 9 -- From the edge of the terminal moraine of the Langtang Lirung Glacier, there is a 360 degree view of icy peaks, and below is the monastery town of Kyanjin blanketed in overnight snow.

Towering above is Langtang Lirung with snow being blown off its 7,227m summit, with the jagged peaks of Kimshun standing like bodyguards with Tserko Ri, Yala Peak and Gang Chhenpo. And to the south is the rampart of the Naya Kanga ridge.

"When I was a boy we brought the yaks up here to graze, and they could cross the ice from one side of the glacier to the other," says Gyalbu Tamang. "This lake was formed only in the last 20 years."

As climate change thaws the mountains, right across the eastern Himalaya in Nepal, Bhutan and southern Ti...