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The U.S. Environmental Protection Agency finalized the 2013 percentage standards for four fuel categories that are part of the Renewable Fuel Standard program established by Congress to reduce carbon climate change.

Legislation was introduced in the U.S. Senate to ensure only domestically sourced advanced biofuels are used to meet the U.S. Environmental Protection Agency’s renewable fuel mandate, according to a bill co-sponsor Tennessee Senator Bob Corker (R).

The Environmental Protection Agency proposed a cellulosic biofuel mandate that it said complies with a court ruling that overturned its previous methodology for the mandate.