If It's Global Warming, Why Is It So Cold?

An image from a Twitter post by Dr. Steve Campbell shows two diagrams comparing a 'Stable polar vortex' with a 'Wavy polar vortex'. The left diagram shows a strong jet stream containing cold air over the Arctic. The right diagram shows a weak jet stream allowing cold air to move south and warm air to move north. The overlaid text explains that less Arctic ice leads to a weaker jet stream, which causes cold air to drift south, and that these frigid temperatures are a result of a warming planet, not a cause of it.

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