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From LiveScience.com:
Some fuels from vegetable oil are environmentally better than others.
Biodiesel made from vegetable oil seems to have good green credentials. Several musicians fill their tour buses with it, and environmental entrepreneurs brew it themselves from recycled kitchen grease.
However, expectations that this renewable fuel will deliver significant reductions in greenhouse gases may be too high.
"The general belief is that biodiesel offers a huge benefit from a global warming standpoint," said Russell Heinen, vice president of SRI Consulting, which last month released a biofuel report for the chemical industry. "We found that it's not necessarily that great."
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