Cheap But Imperfect Can Geoengineering Slow Climate Change?

Canadian environmental scientist David Keith wants to change the world's climate by creating a type of sun filter in the sky to halt global warming. In an interview, he argues the technology is effective and inexpensive, but critics liken it to a nuclear bomb.
The 1991 explosion of the Mount Pinatubo volcano in the Philippines. "Aerosoles in the stratosphere reduce the rate of climate change," says David Keith.

The 1991 explosion of the Mount Pinatubo volcano in the Philippines. "Aerosoles in the stratosphere reduce the rate of climate change," says David Keith.

ESA
Graphic: Scientists would like to slow global warming by reproducing the effects of a volcano.

Graphic: Scientists would like to slow global warming by reproducing the effects of a volcano.

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