| http://www.w3.org/ns/prov#value | - But politicians who wrote the law didn't anticipate fuel economy to improve as much as it has in recent years, which reduced demand for gasoline.Meanwhile, next-generation biofuels, made from agricultural waste such as wood chips and corncobs, have not taken off as quickly as Congress required and the administration expected.President Barack Obama has championed biofuels since his days as an Illin
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