The greenhouse gas carbon dioxide (CO 2 ) can be converted to carbon monoxide (CO). CO is a starting material that can be used to make all kinds of things ranging from fuels to plastics to specialty chemicals, e.g., titanium dioxide (in white paint), ethanol, methanol, acetic anhydride, formic acid, methyl formate, N,N-dimethylformamide, propanoic acid, and phosgene (a lethal nerve gas, but used to make other higher value compounds). All of those are major commodities in commerce. If an energy efficient way to convert CO 2 to CO could be found, the idea of huge scale carbon capture goes from economically impossible concept to a possibly plausible (profit-generating) economic reality. Maybe. Boffins at MIT have found a method to use electricity to CO 2 to CO at a claimed 100% efficiency (that sounds impossible, but let's ignore that): CO 2 on the right is converted to CO on the left If scaled up for industrial use, this process could help to remo...