Fuel from emissions? Catalyst converts carbon dioxide to ethanol

2011 Buick Regal flex-fuel badgeAt least in North America, ethanol is a contentious fuel. A decade ago, it was seen as a homegrown and carbon-neutral way to use less gasoline—and federal legislation mandated that increasing volumes be blended into U.S. fuel supplies. Much debate followed over using "food for fuel," its supposed carbon neutrality and the footprint of the...