The federal government’s position on ethanol fuel is that it must contribute less to global warming than gasoline does, or why bother promoting it. Yet by some calculations, ethanol is worse because it encourages the destruction of forests to make way for new farmland, many assert. Burning trees releases carbon dioxide into the atmosphere; what is more, the trees are no longer there to absorb carbon dioxide.
Now, two professors at the University of Nebraska counter that gasoline is an even bigger source of heat-trapping gases than previously believed.
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