A poll by the University of Michigan's Transportation Research Institute found that car owners will accept a $100 additional charge for a 20% cut in tailpipe emissions and $250 for an 80% cut. The study also found that car owners are willing to sacrifice a portion of fuel economy and trunk space for lesser emissions. Meanwhile, a study by U.K.-based Element Energy found that drop-in biofuels could slash overall tailpipe emissions in the U.K. by 27% by 2030 at a cost of just $20.68 per year to consumers.

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