“The Virgin Earth Challenge is a prize of $25m for whoever can demonstrate to the judges’ satisfaction a commercially viable design which results in the removal of anthropogenic, atmospheric greenhouse gases so as to contribute materially to the stability of Earth’s climate.”
Wikipedia lists some of the contenders: “Virgin Earth Challenge” >>
Global Research Technologies Announces Successful Carbon Dioxide Air-Capture System.
“Tucson company officially introduces itself on Earth Day. Global Research Technologies, LLC (GRT) has announced its success in ongoing research and development of a proprietary air-capture system to remove carbon dioxide (CO2) from the atmosphere.”