Headlines about Supreme Court cases are almost uniformly misleading, because they suggest the Court is making decisions on policy issues rather than legal issues. The very first words of the opinion, on p. 2, make clear that the legal issue before the Court is very different: https://www.supremecourt.gov/opinions/21pdf/20-1530_n758.pdf The Clean Air Act does not purport to give the EPA blanket regulatory authority ov…
This is the naive version of how SCOTUS works that they teach us in elementary school.
History has shown that the Supreme Court is a political body with its own political agenda. The doctrine and precedent cited is used as a justification for whatever policy they actually want to enact.
Yes, there are some guidelines and guardrails, but this is a case of the tail wagging the dog. They choose their interpretation of law based on the actual impact they want to have on society.