CO2 is not a dangerous pollutant

They got the US Supreme Court to declare CO2 a pollutant! That begs the question, who were the "polluters" during the Mesozoic Era when atmospheric concentrations of CO2 were orders of magnitude higher than they are now? We are wringing our hands and jeopardizing our prosperity because of a minor up tick in CO2 content in an Era where it is disastrously low! We are in an interglacial period and can expect the return of continental glaciation because of low CO2 levels.