On Oct. 5, the Supreme Court will hear one of the most consequential energy cases in years. At the center of the case is a basic question: Can a city use state law to hold American energy companies financially responsible for the alleged local effects of worldwide greenhouse gas emissions?

The case, Suncor Energy v. Boulder County, may have started in Colorado, but its consequences will not stay there. It could give the climate Left a powerful way to impose punitive regulation whenever its agenda fails in Washington.

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