Interesting, I was going off the NYT summary when the news broke:
Forty years ago, when Chevron was decided by a unanimous but short-handed six-member Supreme Court, with three justices recused, it was generally viewed as a victory for conservatives. In response to a challenge from environmental groups, the justices sustained a Reagan-era interpretation of the Clean Air Act that loosened regulation of emissions, saying the Environmental Protection Agency’s reading of the statute was “a reasonable construction” that was “entitled to deference.”