The D.C. Circuit granted in part and denied in part Delaware's and Maryland's challenges to EPA's denial of their CAA §126(b) petitions requesting that the Agency impose additional limitations on certain upwind sources contributing to the states' nonattainment of ozone NAAQS.

The Sixth Circuit affirmed a district court ruling that denied city and state officials' motions to dismiss residents' bodily integrity claim stemming from the water contamination crisis in Flint, Michigan.

The Ninth Circuit vacated and remanded a district court ruling denying San Francisco's and Oakland's motion to remand to state court a lawsuit alleging that oil companies make and sell products that create a public nuisance—sea-level rise—when combusted.

The Ninth Circuit affirmed in part a district court ruling granting California counties' and cities' motions to remand to state court a lawsuit against oil companies alleging nuisance and other causes of action arising from the role of fossil fuel products in global warming.

The Ninth Circuit upheld a district court ruling that Oakland, California breached its contract with a company to develop a commercial rail-to-ship terminal on a former U.S. Army base near the San Francisco Bay.

In an unpublished opinion, the Ninth Circuit affirmed in part and dismissed in part a challenge to the Forest Service's decision to authorize logging in Idaho's Nez Perce-Clearwater National Forests.

The Ninth Circuit affirmed in part and vacated in part summary judgment for DOI in a challenge to its issuance of secretarial procedures authorizing a Native American tribe to operate a hotel and casino in Madera, California.