which the atmospheric CO 2 concentration was approximately equal to the concentration we
measure today (ca. 400 ppm). Sea surface temperature (SST) proxies indicate above-
average warming over the North Atlantic in the mid-Pliocene with respect to the pre-
industrial period, which may be linked to an intensified Atlantic Meridional Overturning
Circulation (AMOC). Earlier results from the Pliocene Model Intercomparison Project Phase …