Credit: Mr. Thomas via Flickr. Scientists say too much carbon dioxide is bad for the Earth. And too much carbon monoxide can kill you. So why are researchers at the University of Michigan excited about turning CO2 into CO? Because the end product could come in handy for producing electricity and hydrogen. U of M chemists, along with others from the University of Oxford, say they've come up with an efficient way to turn carbon dioxide into carbon monoxide using visible light (like sunlight). ...Read the full story on TreeHugger