Biofuel advocates resist claims about RFS’ GHG effects

Biofuels groups are touting recent federally backed analyses that they say refute assertions by some environmentalists that the renewable fuel standard (RFS) results in land-use change that increases greenhouse gas emissions, rather than cutting them as required by law. Under the Clean Air Act, biofuels blended into the fuel supply under the RFS must comply with GHG reduction mandates. Conventional, corn-based ethanol, which still supplies the bulk of the biofuel used to meet the RFS goals, must meet a lifecycle...