The D.C. Circuit vacated an interim final rule issued by EPA that would allow manufacturers of heavy-duty diesel engines to pay nonconformance penalties in exchange for the right to sell engines that fail to satisfy nitrogen oxide requirements. In 2001, EPA issued a rule requiring a 95% reduction in...

The Ninth Circuit held that the U.S. Forest Service violated the ESA when it failed to consult with federal wildlife agencies before approving four notices of intent (NOIs) to conduct mining activities in coho salmon critical habitat within the Klamath National Forest. The ...

The Sixth Circuit held that the CAA's citizen suit provision does not allow an environmental group to file suit to compel the state of Ohio to administer a particular federal CAA regulation it has chosen no longer to administer. In 2006, the Ohio General Assembly passed legislation that allows the s...