President Donald Trump is right: greenhouse gases are not dangerous to human health. That reality underscores why former President Barack Obama’s “endangerment finding,” which enabled the regulation of greenhouse gases under the Clean Air Act of 1970, was misguided and constitutionally suspect.

Congress writes the laws. The president executes them. If Congress had intended to regulate greenhouse gases when it passed the Clean Air Act, it would have said so explicitly. Instead, the statute focused on substances that directly harm human health.

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