The atmosphere is only 0.04% CO2, whereas vehicle exhaust is about 13% CO2, so it's much easier (and less energy-intensive) to capture CO2 from a tailpipe. We definitely want to partner with folks working to turn CO2 into fuel — we'd love to turn our CO2 into fuel at truck stops so we can put it right back into the trucks.

Foretry is probably the best way of capturing carbon straight out of the air.

"[...] Need somewhere around 50 acres' worth of trees, planted in tropical areas, to absorb the typical emissions produced by an average American in her lifetime. Multiply that by the population of the U.S. and you get 25 million square miles, roughly half the landmass of the world." -- How to Avoid a Climate Disaster, Bill Gates