A top British scientist has come out with new research flatly contradicting the idea that extremely cold winters in North America – like the one just past – will become more frequent due to global warming. This new analysis disagrees completely with the assessment of President Obama's personal science advisor.
Dr James Screen of Exeter uni in England is a mathematician who has been studying the arctic ice sheet for several years. According to a university announcement highlighting his latest research:
Climate change is unlikely to lead to more days of extreme cold, similar to those that gripped the USA in a deep freeze last winter ... [Recent changes in the Arctic climate have] actually reduced the risk of cold extremes across large swathes of the Northern Hemisphere.
New claim: Holdren was simply expressing his “personal opinion”
CEI: 'Holdren’s claim of a growing body of evidence on this issue was simply false. In fact, from September 2013 on, three peer-reviewed studies appeared debunking the notion that polar warming had led to an increase in what are known as winter blocking episodes—situations where extremely low temperatures become locked in for exceptionally long periods of time. That was why, in April, we filed a formal request for correction with OSTP under what’s known as the federal Data Quality Act. After we filed our petition , by the way, yet a fourth study appeared disputing the global warming/polar vortex connection. Yesterday, shortly before OSTP’s 90-day deadline for responding to correction requests, we received the agency’s denial (see below). OSTP claims that Holdren was simply expressing his “personal opinion” rather than any “comprehensive review of the scientific literature”. On its face, this response is shovel-ready nonsense.
'What it will take for the White House to publicly admit that it was grossly wrong. At the very least, it needs to disavow a widely-disseminated YouTube video featuring Holdren explaining the link between last winter’s polar vortex and human-caused climate change. There is no such link.'
'A brand new study, led by Thomas Ballinger of Kent State University, which directly examined the size and magnitude of the 2014 “polar vortex” event and found it to be not particularly unusual...In fact, Ballinger’s team, found, in examining polar vortex behavior across North America since 1948, that the 2014 polar vortex excursion into the lower 48 ranked 6th in southerly extent and 7th in total area. The authors concluded that their analysis “revealed that the spatial features of the January 2014 [polar vortex over the U.S.] were not extreme relative to certain 1948-2013 Januaries.”