Klaus Lackner, a professor of geophysics at Columbia Uniersity, is experimenting with a material composite that chemically binds to carbon dioxide in the air and then, when doused in water, releases the gas in a concentrated form that can easily be captured.
Lackner envisions automated systems, millions, each the size of a small cabin - scattered over the countryside near geologic reservoir that could store the gases they capture. A system based on this material could remove carbon dioxide from the air a thousand times as fast as trees do now.
Movie: http://nanoarchitecture.net
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