A team of scientists from the University of Michigan and Oxford University recently discovered a way to convert "evil" carbondioxide (CO2) into "happy" carbonmonoxide (CO), using... Light! Carbon monoxide has plenty of practical applications - we use the stuff in the chemical industry, to produce electricity, but we also make meat appear fresh with it (is this really that useful of an application? :P). Although useful, the stuff is pretty toxic to us and animals.

The method the scientists came up with is much more efficient than current methods of 'making' carbon monoxide, and inspired by nature's way of doing things. How it works exactly is quite a complicated story, but it suffices to say a photo-synthesizer is used in the process, which explains the involvement of light. The only thing holding back large scale carbon monoxide production is the fact we aren't able to scale up the process these scientists came up with...
Read more at ScienceDaily