Clean-burning ethanol fuel may have a not-so-clean-burning secret.
Ethanol, made from corn and other renewable resources, is promoted as a fuel
that burns cleaner than gasoline and helps reduce greenhouse gas carbon
dioxide.
However, it takes a lot electricity to make ethanol, and power companies say
the most cost-effective way to produce that electricity is from coal.
Environmentalists say that coal is the nation's biggest source of carbon
dioxide.
They say more Earth-friendly fuels like natural gas should be used to produce
the needed electricity.
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