Empirical evidence from Arctic-region waters near Greenland establish robust warming of the Roman PeriodRead here. Map source (click to enlarge).
Despite the bogus claims of the UN's bureaucrats and the IPCC Climategate "scientists," the polar areas of the Northern Hemisphere have had warmer climates prior to the 20th and 21st centuries.
There is a vast body of research and empirical evidence confirming that the Arctic regions, and other parts of the globe, were indeed warmer during both the Roman and Medieval eras. In fact, global warming, cooling and climate change are natural events that never cease - that is irrefutable, unequivocal climate reality.
A peer-reviewed study by Perner et al. just added to that mountain of evidence confirming the robust warming of the Greenland area prior to the the modern era.
Perner, K., Moros, M., Lloyd, J.M., Kuijpers, A., Telford, R.J. and Harff, J. 2011. Centennial scale benthic forminiferal record of late Holocene oceanographic variability in Disko Bugt, West Greenland. Quaternary Science Reviews 30: 2815-2816.
The unique warmth of the Roman Warm Period at Disko Bugt is also supported, in the words of Perner et al., by the "relatively high and stable air temperatures over the Greenland ice cap (Alley et al., 1999) and is associated with enhanced meltwater production as demonstrated in sediment core records from Ammarilik fjord, West Greenland (e.g. Moller et al., 2006)," as well as by "findings from Jennings et al. (2002), who report a warming within the East Greenland Current on the East Greenland shelf from c. 2.1 to 1.4 ka BP." Thus, for this particular part of the planet (and for most of the rest of the world as well), it can be seen that multi-century cycling of climate between relatively warmer and cooler conditions is quite normal. And it can thus be appreciated that 20th-century global warming was only to be expected to occur when it did, and that it could reasonably be expected that the region may warm even more before cooling again, for it still has a ways to go to equal the warmth of the Roman Warm Period or even the Medieval Warm Period, which in many locations was also warmer than it is currently.
Thanks to Marc Morano and Climate Depot.