So the polar ice sheets that are smaller than in 1000 years are an anomaly? That the thickness of glaciers are at all time record thinness. Whack job internet sites.
Ha ha ha,
1,000 years ago was the last time there little to no summer ice,
much lower than todays numbers. Yet Polar Bears are still here and the world didn't die at all at the 280 ppm level.
Taylor & Francis online
Birds and Climatic Change
Kenneth Williamson (1975) Birds and Climatic Change, Bird Study, 22:3,143-164, DOI: 10.1080/00063657509476459
Published online: 24 Jun 2009
“HISTORICAL REVIEW
Between 1000 and 1300 average summer temperatures were about 1°C higher than today, with the mean annual temperature higher by perhaps 4°C in a largely ice-free Arctic. Eric the Red, a renowned world citizen of that time, has been much maligned as the first progressive publicity man for giving Greenland a false image in order to attract settlers; but in truth, the southwest of that vast country was warmer and greener by far than at any time until the Fieldfares Turdus pilaris arrived there in the mid-1930s. The sea-temperature of the Atlantic was higher than it has been since, and there appears to have been none or very little ice to hinder the Vikings’ communications between Iceland, Greenland,Newfoundland and Labrador (Mowat 1965). Indeed Brooks (1926) considers that the polar ice-cap may have disappeared entirely during the summer months, to build anew each winter.”
LINK
Published peer reviewed research doesn't come from whack job internet sites....