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Athens, Madrid mayors also join the effort to reduce emissions via car mandate.

Mayors at C40 Summit in Mexico City look to do their part to reduce the number of annual deaths from transportation pollution.

With all the attention we've been giving lately to the mega-ethanol plants, I thought it was time to shift gears and highlight the options for the DIY crowd. It's not easy to make biofuel yourself, but it's a lot of fun to turn waste grease into something your car can drink.