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Nobody denies that "Congress deliberately leaves leeway in laws to give the executive branch flexibility."

The whole point of this case is that Congress gave the EPA leeway to decide standards and scrubbing technologies for toxic pollutants, and the EPA stretched that leeway far beyond what Congress intended to address a completely different problem involving a non-toxic alleged pollutant.

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The court has already ruled in Chevron v. NRDC that executive agencies have deference in interpretation of statues if Congress has not explicitly granted that power. The Clean Air act was passed in 1970 to ensure air quality, through science and the advancement of our understanding the EPA has identified CO2 as a toxic pollutant. I don't understand why we need an updated law by Congress when the EPA is much closer to the issue.

But does Congress or the EPA get to determine that scope?

You're arguing that the EPA gets to make that call. The supreme court says it's Congress.

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