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Oblivion (movie)
Sci-fi worthy of Malthus
Sci-fi worthy of Malthus

In the new sci-fi movie "Oblivion," Earth's most precious resource is Tom Cruise. But running a close second (spoiler alert) is water. Aliens want it. All of it. This is old hat, science fiction-wise. In "The War of the Worlds," H.G. Wells had Martians coming to Earth to quench their thirst. The extraterrestrial lizards (cleverly disguised as human catalog models) in the 1980s TV series "V" came here to steal our water too -- though they wanted it in part to wash down the meal they intended to make of us. In the more recent "Battle: Los Angeles," pillaging Earth's oceans was the only motivation we're given for why aliens were laying...

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