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A federal appeals court has rejected Kansas' suit over EPA's rejection of its “good neighbor” state implementation plan (SIP) to curb interstate air pollution that the agency replaced with its Cross-State Air Pollution Rule (CSAPR), but the ruling offers few hints on how the court might rule on suits over dozens of other vetoed SIPs.

Swedish engine maker Volvo Powertrain is emphasizing federal appeals courts' competing interpretations of how courts should oversee consent decrees, often used to settle environmental enforcement actions, in its bid for the Supreme Court to reverse a ruling the company says tests the bounds of EPA's enforcement authority.

A coal ash recycling firm is urging EPA to drastically increase its threshold for regulating large-scale coal ash fills in its new ash disposal rule, arguing the limit is based on a "math error" and risks discouraging beneficial reuse of ash in products by erroneously subjecting some facilities to stringent regulatory mandates.

Advanced biofuels producers are urging EPA to give them credit under the renewable fuel standard (RFS) for fuels produced using feedstocks partially processed off-site such as algae or biomass, saying the agency's current statutory interpretation of the RFS limits advanced biofuels production by barring RFS credit for such fuels.

EPA's announcement that it is delaying from June 1 until Jan. 31 some fuel production reporting requirements under its renewable fuel standard (RFS) is prompting concern from advanced renewable fuel officials who say it will exacerbate uncertainty over long-term fuels production and potentially hinder investment in biofuels.

Environmentalists are highlighting specific controls for curbing emissions of the potent greenhouse gas (GHG) methane and other pollutants from oil and gas sources and are urging EPA to implement those approaches as it crafts its proposed emissions standards for new and modified sources in the sector, expected in the coming months.