Ideas worth spreading

TEDSalon 2007 Hot Science

September 2007

|1.4M views

A critical look at geoengineering against climate change

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?

Become a TED Member

Want to hear more great ideas like this one? Sign up for TED Membership to get exclusive access to captivating conversations, engaging events, and more!

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

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

Environmental scientist

See speaker profile

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.

Learn more