Every time severe winter weather strikes the United States or Europe, reporters are fond of saying that global warming may be to blame. A decade ago some scientists proposed that melting Arctic sea ice may cause the polar jet stream winds that confine cold Arctic air to weaken, letting it spill further south. A small trend in observations to 2010 has weakened after another decade of observations. A team of scientists say that there are few signs of colder winters in Eurasia or North America or more frequent weakening or waviness in the jet stream. The researchers ran climate computer models of the Arctic with and without sea ice loss. They found only a tiny effect of sea ice loss on the polar jet stream.

Read more
https://www.sciencemag.org/news/2021/05/landmark-study-casts-doubt-controversial-theory-linking-melting-arctic-severe-winter

Friends of Science
https://friendsofscience.org/