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Sir Richard Branson on Friday announced a $25 million prize for the scientist who comes up with a way to extract greenhouse gases from the atmosphere, comparing it to the 17th-century quest to revolutionize navigation by determining longitude. The Virgin Group chairman was joined by former Vice President Al Gore and other leading environmentalists as he announced the challenge to find the world's first viable design to capture and remove carbon dioxide from the air.
I'm not much of a fan of the greenhouse gas hypothesis accounting for global warming, especially since it has been going on for the last 15,000 years without human intervention. Nevertheless, in reseaching the subject I have come accross a paper entitled :
Capturing Carbon Dioxide From Air
Klaus S. Lackner (firstname.lastname@example.org;
Patrick Grimes (email@example.com;
that seems to fit the criteria quite well. the URL for this document is :http://www.netl.doe.gov/publications/proceedings/01/carbon_seq/7b1.pdf
I suggest you get in touch with these people for further information.