It seems that fake trees may not be the only way to scrub CO2 out of contaminated air; CO2 Solution, of our neighbor Canada, has designed a smoke stack insert to filter out the air using genetically engineered E. coli bacterium to spew an enzyme that helps convert carbon dioxide into bicarbonate, a solid which can be used for a variety of consumer goods, or simply sequestered under ground.
At the moment only a small prototype exists, but it is working, and talks have begun with power companies to scale up the technology and integrate it into large coal plants. I think this is the first time I've heard of intestinal bacteria being used for a purpose I can smile about.
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