Another obvious explanation. We know that large increases in the CO2 in our indoor environments can decrease results on IQ tests. Is there a reason to think t

Another obvious explanation. We know that large increases in the CO2 in our indoor environments can decrease results on IQ tests. Is there a reason to think that small increase in the CO2 in the atmosphere wouldn't produce a proportionally smaller decrease in IQ scores? Or, hopefully, that better insulation causing higher levels of CO2 indoors in testing places wouldn't produce lower scores as another possibility.