Ideas worth spreading

A critical look at geoengineering against climate change

1,533,770 views | David Keith • TEDSalon 2007 Hot Science

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.

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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.