A district court preliminarily enjoined EPA's and the U.S. Army Corps of Engineers' controversial "waters of the United States" rule.

A district court held that it lacked jurisdiction over a coal company's lawsuit challenging EPA's and the U.S. Army Corps of Engineers' controversial "waters of the United States" rule.

The Ninth Circuit held that the U.S. Bureau of Reclamation did not violate the CWA by discharging pollutants into the Klamath River without a permit in connection with its management of an irrigation project along the California-Oregon border.

The D.C. Circuit reaffirmed its prior decision that the Securities and Exchange Commission's (SEC's) "conflict materials" rule violates the First Amendment.

The Second Circuit held that New York's moratorium on hydraulic fracturing did not allow energy companies to extend oil and gas leases they entered into with landowners.

A district court largely dismissed claims challenging California's Low Carbon Fuel Standard, a collection of regulations promulgated by the California Air Resources Board to implement provisions of California Assembly Bill 32, the Global Warming Solutions Act of 2006.