I’ve been looking at the work of Dr. Andrew Glikson and his analysis of geological climate records — specifically the long-term cooling trend from the Holocene Optimum (~9,000 years ago) to the present. His research highlights how the Earth’s climate has been gradually cooling over the past 8,000 years, with the most recent warming period (the Holocene warming) being relatively short-lived compared to the overall trend. This aligns with orbital forcing models that show the Earth is currently in a cooling phase due to decreasing solar insolation. [Source](https://www.researchgate.net/publication/328056554_The_Holocene_Climate_Optimum_and_Its_Implications_for_Future_Climate_Change)