I have been saying this all along after having examined rock cuttings and core from wells drilled in eight different states, as deep as the preCambrian. Every well showed signs of natural climate changes, in the depositional environments of the rocks present, and in the absence (erosional surfaces) of rocks of that age and of other ages in other areas.
For instance, for much of the history of Western North Dakota, it would have been either unsurvivable or decidedly unpleasant for any human, *noting that I consider the current climate 'pleasant' in comparison, a description other humans might take issue with.
I am glad to see that presented in a diagram, normalized for the globe.