The Ninth Circuit held that the Bureau of Reclamation did not violate the ESA when it renewed 41 water service contracts in California despite concerns over the endangered delta smelt.

A district court ordered a mining company to comply with the CWA by October 31, 2012, and to pay over $2 million in penalties for CWA violations in Montezuma Creek, a tributary of the Middle Fork Boise River near Atlanta, Idaho.

The D.C. Circuit dismissed petitions challenging EPA's primary NAAQS for sulfur dioxide (SO2).

The D.C. Circuit dismissed a petition challenging an EPA rule issued under the Energy Independence and Security Act of 2007 (EISA) concerning ethanol fuel.

The D.C. Circuit denied petitions challenging EPA's one-hour primary NAAQS for nitrogen dioxide (NOx).

A Pennsylvania appellate court partially struck down Act 13, which pertains to oil and gas operations in the Marcellus Shale, as unconstitutional.

A district court held that a minor may bring a climate change lawsuit against the state of New Mexico under the public trust doctrine.

A New Jersey appellate court held that a town that acquired property containing a former landfill in an eminent domain action cannot require part of the condemnation award to be set aside for remediation purposes.