The EPA did not regulate carbon dioxide (CO2 subscript 2 end subscript) emissions from motor vehicles until after the U.S. Supreme Court ruled that the EPA had the authority to do so because

the Clean Air Act does not mention CO2 subscript 2 end subscript emissions.

scientists do not all agree that CO2 subscript 2 end subscript contributes to climate change.

climate change has widespread effects, not particularized harms.

CO2 subscript 2 end subscript emissions constitute a public danger