What happens when the roof of the world melts?

The ice that has long defined South Asia's mountain ranges is dissolving into massive new lakes, raising the specter of catastrophic flooding.

Gokyo village, nestled beside a lake fed in part by Nepal’s Ngozumba Glacier, doesn’t face immediate danger from flooding, but other Himalayan communities are threatened by rising glacial lakes.
Photograph by GETTY IMAGES, FENG WEI PHOTOGRAPHY

Fly in a jet over Mount Everest, and you will soar over a sea of jagged white peaks stretching endlessly to the horizon.

It’s a landscape like no other on the planet—the colossal glaciers of the Himalaya, which for millennia have been replenished by monsoons that smother the mountains in new snow each summer.

But take that same jet trip 80 years from now, and those gleaming ice giants could be gone.

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