The Tenth Circuit reversed and remanded a district court ruling upholding FWS' designation of critical habitat for the endangered jaguar. Ranching groups challenged the designation because it did not comport with the ESA's requirement that such areas be "essential for the conservation of the species...

The D.C. Circuit denied a petition to review the Pipeline and Hazardous Materials Safety Administration’s rule regulating disclosure requirements for railroad companies transporting hazardous materials. A company argued that the rule, which required railroads to release an aggregated report to off...

The D.C. Circuit granted a petition to reconsider EPA's Final Mercury and Air Toxics Standards (MATS) Rule that exempted coal- and oil-burning power plant boilers' startup periods from numerical limits on hazardous air pollutants (HAPs). Environmental groups challenged the Agency's denial of their p...