Thanks to an economy long dependent on fossil fuels, the atmophere has become an increasingly effective heat trap. Overnight temperatures are still cooler than daytime temps, but they’re rising faster than daytime temps are, so the difference between night and day is shrinking.
It’s the same story for the Arctic and points south. The Arctic is still cooler than points south, but it’s warming faster, so the difference between up there and down here is shrinking. This is making a difference to the Northern Hemisphere’s jet stream, weakening it, which, in turn, is setting cold Arctic air masses free to fly south.
The polar vortex is the name of cold Arctic air normally swirling around the North Pole. With a weakened and more widely meandering jet, we get what you see here
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“The poorest half of the world population is responsible for only around 10% of total global emissions attributed to individual consumption.”
Exposing the Big Game 
Reblogged this on The Extinction Chronicles.