The morning read on Wednesday, April 23, 2019.
The court is examining Diamond Alternative Energy LLC v. EPA this morning, a dispute brought forth by fuel producers regarding California’s waiver of federal preemption in vehicle-emissions standards, which typically require lower emissions in California, under the Clean Air Act. The waiver was introduced, in part, in recognition of the fact that California was the only state that regulated emissions before the CAA’s enactment.
Each weekday, we select a short list of news articles and commentary related to the Supreme Court. Here’s the Wednesday morning read:
Recommended Citation:
Ellena Erskine,
The morning read on Wednesday, April 23,
SCOTUSblog (Apr. 23, 2025, 11:32 AM),

