"the medieval warm period was warme[r] than today, which is false" Why is that false? There are many possible explanations for the latter anomalies - our CO2

"the medieval warm period was warme[r] than today, which is false" Why is that false? There are many possible explanations for the latter anomalies - our CO2 output likely is part of influence, but hardly the only. Global temperatures, ocean acidity, and the ozone layer have all fluctuated dramatically over time, even long before humans existed. In fact, in the Archaean period and earlier, earth did not even have an ozone layer.