The D.C. Circuit, in a split ruling, vacated certain provisions of EPA's rule phasing out the use of hydrofluorocarbons (HFCs). Two companies and three trade groups argued EPA exceeded its…

The First Circuit amended a previous ruling vacating an air permit issued by the Massachusetts Department of Environmental Protection (MDEP) for a proposed natural gas compressor station that is…

The Washington Supreme Court invalidated a rule promulgated by the state's Department of Ecology authorizing regulation via emission standards of businesses that do not directly emit…

The Federal Circuit held that the state of California did not infringe on an emissions trading-related patent, allowing the state's greenhouse gas emissions cap-and-trade program to continue…

A district court held that owners of Volkswagen-branded franchise dealerships could move forward with their suit against an auto parts manufacturer over its alleged role in the Volkswagen diesel…

A district court held that BLM violated the APA when it postponed compliance with Obama-era greenhouse gas emission rules. Several states and tribal citizen groups brought suit against BLM when it…

The Washington state Shorelines Hearing Board denied plans to build a methanol refinery on the Columbia River because the plans failed to adequately consider greenhouse gas emissions. A…

The D.C. Circuit held that carbon emissions from gas-burning power plants should have been considered in federal regulators’ review of a Florida natural gas pipeline. Environmental groups and…

A district court held that New York's Zero-Emission Credit (ZEC) program is not preempted by federal law. In an effort to curb the effects of global warming, New York issued a Clean Energy…

The Iowa Supreme Court held that neighbors of an Iowa corn processing plant were properly certified as a class to pursue pollution claims against the operator. The neighbors filed a suit under…