Giant Ice Shield Will Fight Global Warming

To combat global warming and the urban island heat effect, Mongolia is launching the world's largest ice-making experiment. It hopes to use the ice to cool its capital during summer. 

What's the Latest Development?


Outside its capital Ulan Bator, Mongolia is launching the world's largest ice-making experiment in hopes of combating global warming and the urban heat island effect. "The project aims to artificially create 'naleds'—ultra-thick slabs of ice that occur naturally in far northern climes when rivers or springs push through cracks in the surface to seep outwards during the day and then add an extra layer of ice during the night." If successful, the technique could be used in other northern cities. 

What's the Big Idea?

Creating naleds is a relatively benign geoengineering project. More ambitious ones, which seek to influence the Earth's climate, have included creating stratospheric sulfur aerosols. "Everyone is panicking about melting glaciers and icecaps, but nobody has yet found a cheap, environmentally friendly alternative," said Robin Grayson, a Mongolian-based geologist. By drilling bore holes in ice flows from the Tuul River, scientists will be able to create ice sheet up to seven meters thick. 

Photo credit: Shutterstock.com

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