A district court granted summary judgment for 21 states in a challenge to the Federal Highway Administration's (FHwA's) rule requiring each state to set declining targets for tailpipe carbon dioxide (CO2) emissions from vehicles on the National Highway System. The states argued requiring automobile ...

The D.C. Circuit upheld EPA's 2022 decision to reinstate a prior waiver of federal preemption of two California regulations concerning automobile emissions under the CAA. States and fossil fuel groups challenged the regulations—a standard limiting greenhouse gas emissions and a requirement that a ...