“There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.” ― Mark Twain

This week in 1974, the worst tornado outbreak in US history occurred. Climate experts blamed it on global cooling, which was causing an expansion of the polar vortex and expanding Arctic ice.

TIME Magazine Archive Article — Another Ice Age? — Jun. 24, 1974

Climate experts now know that the polar vortex and extreme weather is caused by global warming and shrinking Arctic ice.