This is how you fool people.
“Then consider that the left graph comes from a consortium of over 90 climate scientists, who took 7 types of samples from 32 countries. Meanwhile, the right graph comes from one data point: ocean surface temperatures of the Sargassum Sea. It shows that this region was especially warm during the Middle Ages, but when you look closer, this Medieval Warm Period was limited to the North Atlantic, where the Sargassum Sea lies.”
https://unchartedterritories.tomaspueyo.com/p/how-bad-is-co2