The U.S. Supreme Court held that the United States may pursue claims against New Mexico for violating the Rio Grande Compact, which Colorado, New Mexico, and Texas entered into in the 1930s to resolve disputes over water rights. Texas filed suit alleging that New Mexico was allowing its residents to...

A district court upheld the U.S. Department of Homeland Security's (DHS') decision to waive the legal requirements of NEPA, ESA, and CZMA for two border wall construction projects in San Diego, California. DHS made its waiver determination under §102 of the Illegal Immigration Reform and Immigrant ...

A district court held that San Francisco and Oakland, California, may not remove back to state court their climate change public nuisance actions against several oil companies. The defendants—the largest cumulative producers of fossil fuels worldwide—timely invoked federal common law as a ground...

The Ninth Circuit held that NOAA did not go beyond its authority when it took climate change into account when considering the ESA status of the Arctic ringed seal. In 2012, NOAA listed the Arctic ringed seal as threatened based on projected sea ice loss. Oil and gas companies challenged the ruling,...

The U.S. Supreme Court, in an unsigned judgment and decree, ordered Wyoming to pay Montana $20,340 in damages, plus $67,270.87 in costs, for reducing the amount of water available in the Tongue River in violation of the Yellowstone River Compact. The Compact protects pre-1950 appropriative rights to...