Read here. The climate alarmism bozos/bimbos brigade (Al Gore, Kevin Trenberth, John Cook, Joe Romm, Heidi Cullen, Bill McKibben, Michael Mann, Bill Nye, Jeff Masters and etc.) has claimed that past severe winter conditions were the result of CO2-induced global warming. They did so without a sliver of scientific proof nor empirical evidence.
As the general public deduced, the brigade's claim that extreme winter conditions are being caused by "global warming" is a complete crock. And to the major chagrin of the likes of Kevin Trenberth, the climate modelers are now pointing their collective fingers at the real culprit - the sun. Losing the public and climate/solar science debate both - Ouch!
The team of Ineson et al. determined that a strong solar signal (positive or negative) will cause significant changes in the North Atlantic Oscillation. The NAO change produces affects on the winter circulation patterns resulting in a dearth or abundance of Northern Hemisphere severe winter storms. Using climate models, they established a firm relationship between solar maximum/minimum and the change in the NAO.
"A research team...primarily made up of scientists from the U.K.’s Hadley Centre Met Office have identified a fairly strong solar signal in Northern Hemisphere winter circulation patterns which are manifest over Europe and the eastern United States. According to their modeling studies, the difference in the amount of incoming solar radiation, in this case, primarily in the ultraviolet (UV) wavelengths, during the minima and maxima of the 11-yr solar cycle are large enough to produce a characteristic change in the winter circulation pattern of the atmosphere over North America...When the NAO is in its negative phase, more cold air can seep south from the Arctic and impact the lower latitudes of Europe and the eastern U.S., which helps spin up winter storm systems. For instance, during the “snowmageddon” winter of 2009/2010, the NAO was at a near record low value..."Given our modelling result, these cold winters were probably exacerbated by the recent prolonged and anomalously low solar minimum. On decadal timescales the increase in the NAO from the 1960s to 1990s…may also be partly explained by the upwards trend in solar activity evident in the open solar-flux record…."" [Sarah Ineson, Adam A. Scaife, Jeff R. Knight, James C. Manners, Nick J. Dunstone, Lesley J. Gray, Joanna D. Haigh 2011: Nature Geoscience]