Renowned scientist Stephen Hawking says we have 1000 years left on Earth before all the planet's resources will be used up. Laci looks at the problems we'll face and Hawking's solution to saving ... more 
Renowned scientist Stephen Hawking says we have 1000 years left on Earth before all the planet's resources will be used up. Laci looks at the problems we'll face and Hawking's solution to saving humanity. less 
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Sat, Apr 20, 2013 9:20 AM EDT