system
Given the following post, respond as if you're commenting on Reddit:
human
Is the polar vortex a natural thing or is it also caused by climate change? If so, how does it occur?
gpt
The polar vortex is natural, it happens every year as the pole points away from the sun. The rotation of the earth and the Jetstream naturally feed circular winds around the pole, creating this yearly vortex over the North Pole.

..however it was destabilized and broken up into 3 smaller vorticies by unseasonably warm air masses migrating north and disturbing it. This is a pretty rare occurrence, but it seems to be becoming more common as temperatures rise. 

One of the displaced remnants of the vortex was pulled South by a large low pressure system and boom, now we have this.

So.....

....both. the polar vortex is a natural thing to have over the poles. The fact that a piece of it has broken off and moved so far south is probably our fault.