Ideas worth spreading

A critical look at geoengineering against climate change

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David Keith |

TEDSalon 2007 Hot Science

• September 2007

Environmental scientist David Keith proposes a cheap, effective, shocking means to address climate change: What if we injected a huge cloud of ash into the atmosphere to deflect sunlight and heat?

Environmental scientist David Keith proposes a cheap, effective, shocking means to address climate change: What if we injected a huge cloud of ash into the atmosphere to deflect sunlight and heat?

This talk was presented at an official TED conference. TED's editors chose to feature it for you.

About the speaker

David Keith

Environmental scientist

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David Keith studies our climate, and the many ideas we've come up with to fix it. A wildly original thinker, he challenges us to look at climate solutions that may seem daring, sometimes even shocking.

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This talk was presented at an official TED conference. TED's editors chose to feature it for you.