The Environmental Protection Agency is expected to release new rules soon regarding the Renewable Fuel Standard established last year under the Energy Independence and Security Act. The legislation required the EPA take into account the life-cycle greenhouse gas emissions from the production of various biofuels, including indirect emissions from things like land use changes. ... Several environmental groups also sent a letter [PDF] to Johnson urging him to uphold the requirements established by Congress. "[I]t would be both unlawful and irresponsible for EPA to delay evaluation of emissions from land use changes," wrote representatives from the Clean Air Task Force, the Environmental Working Group, and Friends of the Earth. ...