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Published online 29 April 2009 | Nature 458, 1083 (2009) | doi:10.1038/4581083a
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California in clean-fuel drive
State rule says biofuels aren't so green.
The state of California has adopted regulations to curb greenhouse-gas emissions from transportation fuels, codifying evidence that biofuels are significantly dirtier than they were once thought to be.
The California Air Resources Board approved its 'low-carbon fuel standard' on 23 April, requiring fuel providers to cut the greenhouse-gas emissions from fuels by 10% by 2020, compared with 2010 levels.
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