I've been looking at the work of Dr. Richard Alley and his team on ice core data from Greenland — their research shows that the past few thousand years have actually been part of a relatively stable, warm period compared to the last few ice ages. The cooling trend they mention is more about the transition from the last glacial period to the Holocene, not a long-term decline in temperatures. The last 10,000 years have been overall warmer than the preceding 100,000. [Source](https://www.nature.com/articles/s41586-020-2660-6)