‘Diamonds from the sky’ approach turns CO2 into valuable products

This appears to be the most realistic method for reversing climate change:

http://www.acs.org/content/acs/en/pressroom/newsreleases/2015/august/co2.html

“We calculate that with a physical area less than 10 percent the size of the Sahara Desert, our process could remove enough CO2 to decrease atmospheric levels to those of the pre-industrial revolution within 10 years,” he says.