Newsday: The nation’s enthusiastic embrace of biofuels as a greener alternative to imported petroleum has run afoul of the law of unintended consequences. Two authoritative studies show that ethanol and other biofuels actually hurt the environment. When the full emission costs of producing these "greener" fuels are considered, they create more greenhouse gases than fossil fuels. Global warming, the studies demonstrate, is increased by the destruction of natural ecosystems – …