The Administrator shall by regulation prescribe (and from time to time revise) in accordance with the provisions of this section, standards applicable to the emission of any air pollutant from any class or classes of new motor vehicles or new motor vehicle engines, which in his judgment cause, or contribute to, air pollution which may reasonably be anticipated to endanger public health or welfare.
It is telling to see text from the 60s reinterpreted to include climate change in the 2000's. Personally I think the text was obviously intended to address pollution (poisonous shit) that directly endangers public health......not contributes to global changes in the earths climate that can then endanger public health or welfare.
Personally I think the reinterpretation in the 2000s was wrong and opportunistic. If people think green house gases like those emitted as a result of breathing are harmful to public health due to contributions to climate change and they want regulation to that effect then lawmakers should vote on legislation to implement such regulation.
If one political faction is allowed to intrepret legislation one way it is hard to care about hurt feelings when another faction comes in and is allowed to reinterpret it in another. I am not addressing the merits of the underlying issue only my view that the process being utilized here sucks.