A North Carolina court issued a preliminary injunction barring the state Mining and Energy Commission from accepting or processing any hydraulic fracturing applications until the state Supreme Court issues its opinion in a similar case concerning the constitutionality of the Commission's app

The First Circuit reversed a lower court decision dismissing a lawsuit concerning a proposed offshore wind power generation facility in Nantucket Sound.

The D.C. Circuit ordered EPA to submit a timeline for when it will issue its financial assurance rules under CERCLA to ensure that industries that handle hazardous substances have the financial means to clean up any releases.

A district court held that a PRP established the divisibility defense and, therefore, is not jointly and severally liable for cleanup costs at the Lower Fox River Superfund site in Wisconsin.

The D.C. Circuit held that a home builders' association lacked standing to challenge EPA's and the U.S. Army Corps of Engineers' determination that two reaches of the Santa Cruz River in southern Arizona constitute "traditional navigable waters" (TNW) under the CWA.

The Ninth Circuit held that EPA violated the CAA when it approved California SIPs concerning NAAQS for ozone and fine particulate matter in the San Joaquin Valley. The SIPs relied on state-adopted mobile emissions standards to achieve their emission reduction goals.