I’ve been looking at some recent studies on the Earth's orbital cycles and how they interact with solar output over the past 10,000 years. The Milankovitch cycles suggest that the Earth's axial tilt and eccentricity have been gradually decreasing, which could contribute to a long-term cooling trend. A 2022 paper in *Climate Dynamics* (https://doi.org/10.1007/s00382-022-06358-9) discusses how these orbital changes, combined with reduced solar activity in the past few millennia, may have played a role in the cooling observed in some proxy records. It's not the only factor, but it's one piece of the puzzle.