A district court dismissed as moot a lawsuit seeking to reinstate a permit for the Keystone XL oil pipeline to cross the U.S.-Canada border. Twenty-three states challenged the president's authority to revoke the permit, arguing the permitting decision concerned only international and interstate comm...

A district court denied a water district's motion to intervene in an ESA lawsuit seeking protections for longfin smelt. The water district argued it had standing to intervene because its alleged injury—a reduction in water allocation—was economic, its injury was traceable to plaintiff's claims s...

The Fifth Circuit affirmed in part and reversed in part district court rulings in a collection of lawsuits concerning oil companies' decades of drilling activities along the Louisiana coast. Six Louisiana parishes filed suit in state court, arguing the companies violated the Louisiana State and Loca...