"We can tell indirectly from sediments and deposits laid down during these periods. The presence of tropical plant and animal remains at the polar latitudes indicates that significantly warmer conditions must have existed as compared to today. Conversely, the absence of tree pollen in the tundra probably means that conditions were too cold for trees to grow."
My chart shows a swing of 1.5 degrees Celsius on average. Sediments and absence of tree pollen are not indicative of a 1.5 degree fluctuation in temperature nor can they shew the average global temperature from 2,000 years ago....but you can pretend they do 🤦🏻♂️
"We can tell indirectly from sediments and deposits laid down during these periods. The presence of tropical plant and animal remains at the polar latitudes indicates that significantly warmer conditions must have existed as compared to today. Conversely, the absence of tree pollen in the tundra probably means that conditions were too cold for trees to grow."
https://www.giss.nasa.gov/research/briefs/schmidt_01/
Took a grand total of 3 seconds to find this info.
My chart shows a swing of 1.5 degrees Celsius on average. Sediments and absence of tree pollen are not indicative of a 1.5 degree fluctuation in temperature nor can they shew the average global temperature from 2,000 years ago....but you can pretend they do 🤦🏻♂️