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Here we're quite happy to report about progress on the so-called "Second Generation" biofuels, such as cellulosic ethanol, which yield cleaner results than "First Generation" ones like corn ethanol. However, there is also something that the French site MoteurNature calls "Zero Generation" biofuel: ...

A roundup of alternative fuels is presented in Popular Mechanics’ May issue, with a summary of what each fuel is, the pro’s and con’s for the fuel, and the future outlook for each one of them. The alternatives for gasoline and diesel under consideration are ...