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Here’s a simple solution to global warming: vacuum carbon dioxide out of the air.

Klaus Lackner, a physicist at Columbia University, said placing enough carbon filters around the planet could reel the world’s atmosphere back toward the 18th century, like a climatic time machine.

He estimates that sucking up the current stream of emissions would require about 67 million boxcar-sized filters at a cost of trillions of dollars a year.

The orchards of filters would have to be powered by complexes of new nuclear plants, dams, solar farms or other clean-energy sources to avoid adding more pollution to the atmosphere. LA Times, 29 Apr 2008