Medieval Warm Period Rediscovered
A recent article in the journal Science has provided a new, detailed climate record for the Medieval Climate Anomaly (MCA), also know as the Medieval Warm Period. It was the most recent pre-industrial warm period, noted in Europe and elsewhere around the globe. The researchers present a 947-year-long multi-decadal North Atlantic Oscillation (NAO) reconstruction and find a persistent positive NAO during the MCA. The interesting thing is that the MCA had basically been removed from the climate record by Michael Mann's infamous “hockey stick” history graph that was adopted by the IPCC a decade ago........This is just the latest in a series of reports that quietly contradict some of the more outlandish untruths spread by the anthropogenic global warming extremists of the IPCC. Another recent Science article, by Brierly et al., addresses the Pliocene warm interval, a period of warm climate conditions that preceded the current Pleistocene Ice Age. Occurring some 4 million years ago, the Pliocene warm interval has been difficult to explain.
The early Pliocene epoch from 5.3 to about 3 million years ago was much warmer than today. The early Pliocene climate was very much like preindustrial conditions during the Holocene (our current interglacial warm period). Similarities include the amount of solar radiation Earth received, the concentration of atmospheric CO2, and a nearly identical geographic environment. But there were also significant differences. For example, there was no permanent ice sheet in the Northern Hemisphere, and global sea level was 80 feet (25 m) higher. Why is our climate today so different?....
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