The Last Time CO2 Was This High, Humans Didn’t Exist https://www.climatecentral.org/news/the-last-time-co2-was-th...
CO2 – Why 450 ppm is Dangerous and 350 ppm is Safe https://sustainabilityadvantage.com/2014/01/07/co2-why-450-p...
And of course this one: https://skepticalscience.com/co2-higher-in-past.htm
The Last Time CO2 Was This High, Humans Didn’t Exist https://www.climatecentral.org/news/the-last-time-co2-was-th...
CO2 – Why 450 ppm is Dangerous and 350 ppm is Safe https://sustainabilityadvantage.com/2014/01/07/co2-why-450-p...
And of course this one: https://skepticalscience.com/co2-higher-in-past.htm