Read here. IPCC scientists still claim that the Medieval Warming was limited to the northern European region despite all the evidence otherwise. Adding to that 'otherwise,' researchers documented a confirmed Medieval warming and associated dry precipitation levels within the Panama region, near the Equator.
"The authors conclude that "the correspondence between warm medieval temperatures and dry hydrologic anomalies in Panama supports a large-scale Medieval Climatic Anomaly that may have been global in extent, and involved atmospheric circulation reorganizations that are linked to ENSO.".....noting that such reorganizations of earth's climate system are not dependent on rising atmospheric CO2 concentrations to trigger them, and, therefore, that the development of the Modern Warm Period likely was largely unrelated to the concomitant increase in the air's CO2 concentration"