There is a more-or-less constant stream of air moving across the US. This stream of air is pushing the cold air at the north pole up north.
As the earth warms, this stream of air weakens. It can't push the cold air up north, which causes the titty that is the polar vortex to sag ever southwards.
I've pictured an EV as something you'd treat like a cell phone - once you are home and not using it anymore, you plug it in to charge. Is this what you do, or do you use charging stations? It seems like a great way to avoid standing in the cold pumping gas.