The scientists at Sandia National Laboratories have found a way to recycle CO2 (carbon dioxide) into energy using the sun.  Of course, it’s true that plants and trees have been doing this for thousands of years, turning carbon dioxide into our breathable oxygen.  I think could be definitely worthwhile to keep a watch on.  Who knows, we might have cars in the future that literally run off human breath.  By then, we should also have cars that run purely on solar power so, more the merrier!

The machine is designed with a chamber on each side. One side is hot, the other cool. Running through the center is a set of 14 Frisbee-like rings rotating at one revolution per minute. The outer edge of each ring is made up of an iron oxide composite supported by a zirconium matrix. Scientists use a solar concentrator to heat the inside of one chamber to 1,500 º C, causing the iron oxide on one side of the ring to give up oxygen molecules. As the affected side of the ring rotates to the opposite chamber, it begins to cool down and carbon dioxide is pumped in. This cooling allows the iron oxide to steal back oxygen molecules from the CO₂, leaving behind carbon monoxide. The process is continually repeated, turning an incoming supply of CO2 into an outgoing stream of carbon monoxide.

via technologyreview