For all the attention paid to alternative fuels, there's only one that has made any real headway in the U.S.: ethanol. And now the evidence is piling up that biofuels may be even worse for the environment than the gasoline they're meant to replace. Corn ethanol is particularly inefficient corn has comparatively less energy than gasoline or even sugar cane, and so a large amount of the crop needs to be distilled to make a gallon of ethanol. As ethanol scales up, more corn is used for fuel instead of food causing food prices to rise. Worse, a study in October found a loophole in the Kyoto Protocol that allows unfettered biofuel pollution. Since biofuels are considered 100% carbon neutral under that pact even though they clearly aren't companies seeking to meet their carbon cap could invest in biofuels, which would clear more land, which would emit more carbon. There's still hope for second-generation biofuels like algae or cellulosic, but it's becoming clear that the greenest way to run our cars will come out of the electrical outlet.