"Negative Carbon" technology seems to be getting traction

http://www.scientificamerican.com/article.cfm?id=washing-carbon-out-of-the-air
http://www.carbonsciences.com/
http://www.globalthermostat.com/
The idea is to build it alongside renewable energy plants. When the wind is blowing but the grid doesn't want the power (e.g. early hours of the morning) spare power is used to run carbon-sucking devices, so renewable energy power plants go from being zero-carbon to negative carbon. Neat.