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Published on 17 Aug 2007
Natalie Portman, Kyra Sedgwick and Chloe Sevigny explain how an action as simple as changing a light bulb can help reverse the effects of greenhouse gases. Featuring the music of Aimee Mann and remarkable footage from the National Geographic library. ➡ Subscribe: http://bit.ly/NatGeoSubscribe
About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.