A district court denied environmental groups' motion for partial summary judgment in a CAA citizen suit brought against a steel company concerning hydrogen sulfide and sulfur dioxide emissions at its production facilities in Pennsylvania. The groups argued the company repeatedly violated the CAA, th...

A district court denied environmental groups' motion for a temporary restraining order in a challenge to BLM's authorization of livestock grazing on pastures containing research natural areas (RNAs). The groups argued BLM's regulations required fencing to be installed to section off the RNAs so they...

A district court granted in part and denied in part conservation groups' motion for summary judgment in a challenge to NMFS' 2019 decision not to list the alewife and blueback herring as threatened under the ESA. The groups argued that NMFS failed to adequately account for climate change-related har...

The Ninth Circuit, 2-1, affirmed in part and reversed in part summary judgment for DOI in a challenge to its approval of a mine expansion proposal in Montana. Environmental groups argued DOI violated NEPA by failing to take a "hard look" at the actual environmental effects of the expansion's greenho...

The U.S. Supreme Court, 5-4, granted states' and industry groups' application for an emergency stay of a district court ruling that had vacated the 2020 Clean Water Act 401 Certification Rule. In a dissenting opinion, Justice Kagan asserted the states and groups had failed to show they would suffer ...

A district court dismissed as moot a challenge to EPA's and the Army Corps of Engineers' 2015 Clean Water Rule interpreting the phrase "waters of the United States." Ohio and Tennessee argued the 2015 rule improperly expanded the definition of "waters of the United States," giving the agencies the p...

The Ninth Circuit affirmed a district court order granting a nonprofit business group's motion to preliminarily enjoin California's attorney general from filing or prosecuting new lawsuits to enforce the state's Proposition 65 warning requirement for cancer as applied to acrylamide in food and bever...

The Fifth Circuit granted the Biden Administration's motion to stay a district court ruling enjoining federal agencies from implementing interim estimates on the social cost of greenhouse gas emissions. States had argued the president lacked authority to promulgate and enforce the estimates; that th...

A district court dismissed as moot a yearslong lawsuit challenging President Trump's issuance of a presidential permit in 2019 for construction of a cross-border segment of the Keystone XL oil pipeline. Environmental groups had argued the former president violated the Property Clause, the Commerce C...

A district court granted in part environmental groups' motion for summary judgment in a challenge to BLM's issuance of a 2018 instruction memorandum on greater sage grouse conservation and and subsequent oil and gas lease sales in Nevada and Wyoming. Environmental groups argued the lease sales confl...