China's Extreme Cold Snap: Polar Vortex Weakness and Train Crash Tragedy

The recent wave of extreme cold weather in China, which brought record low temperatures and rare snowfall to southern regions, may be linked to a weakening of the polar vortex. The polar vortex, a fast-moving band of air currents that normally keeps Arctic air from invading lower latitudes, may have experienced a leak, allowing the cold air to move southward. Climate scientists attribute the weakening of the polar vortex to global warming and the phenomenon of Arctic amplification. The occurrence of severe cold waves does not contradict global warming but rather highlights the increasing instability of the climate system.