What's Causing the "Earth Without Us" Craze in New Scifi Movies?

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Following on the tail of the hit book The World Without Us by Alan Weisman, and the documentary Life After People, Hollywood seems determined to make scifi movies that explore the same theme. Certainly we've had "Earth without most of us" flicks like I Am Legend, but two movies that were on proud display at WonderCon, Wall-E and Journey to the Center of the Earth were literally about an Earth that has no humans at all.

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