A district court denied summary judgment for environmental groups in a challenge to FWS' 2015 rule that classified any reestablished black-footed ferret population in Wyoming as a nonessential experimental population. The groups argued FWS' designation of reintroduced ferrets as "nonessential" viola...

In a per curiam opinion, the D.C. Circuit granted industry groups' petitions and denied environmental groups' petition to review EPA's application of a 2022 rule that classified industrial boilers built after 2010 as "new" rather than "existing" sources of hazardous air pollutants. The industry grou...

A district court affirmed BLM's resource management plan (RMP) amendment and record of decision (ROD) concerning wild horse management in southern Wyoming. Conservation and wild horse advocate groups argued BLM's decision to revert two herd management areas to "herd area" status, of which the approp...

A district court granted summary judgment for environmental groups in a challenge to NMFS' biological opinion (BiOp) on the impact of oil and gas extraction in the Gulf of Mexico on protected marine life. The groups argued NMFS violated the APA and the ESA by issuing a flawed BiOp that underestimate...

In an unpublished opinion, the Ninth Circuit reversed a lower court's vacatur of an incidental take statement (ITS) issued by NMFS authorizing a troll fishery in Alaska to harvest Chinook salmon despite potential reduction in prey for the endangered southern resident killer whale, and affirmed its d...

In a per curiam opinion, the D.C. Circuit dismissed in part and denied in part challenges to EPA's 2022 denial of pending Renewable Fuel Standard (RFS) exemption petitions filed by small refineries. EPA had determined the only costs relevant to showing economic hardship were those caused by complian...

The D.C. Circuit denied a chemical manufacturer's and two trade groups' petitions to review EPA's 2020 rule regulating emissions from miscellaneous organic chemical manufacturing facilities. The petitioners challenged EPA's assessment of cancer risk from exposure to ethylene oxide emissions. The cou...

A district court granted in part and denied in part summary judgment for environmental groups in a challenge to FWS' 2020 revised 12-month finding on a petition to list the Upper Missouri River distinct population segment of arctic grayling. The groups argued FWS failed to analyze the adequacy of ex...

The D.C. Circuit denied a petition to review EPA's 2023 regulations that imposed new reporting requirements on biogas producers. An industry group argued, among other things, that EPA had no authority to regulate biogas producers and that three categories in the regulations—those related to biogas...