I agree with you. People are far too optimistic. On a practical level, though, how much of these increasing issues can be temporarily ameliorated by better ventilated houses, schools, offices, etc.? In other words, does reducing the average exposure of CO2 help or is it really about the outdoor level? I could see the average mattering, but I could also see how spending time in an environment that is <400ppm CO2 (basically never happens now) could cause our bodies to rapidly expel CO2 and "reset" our internal levels.