Maybe we should also consider underwater colonies, space colonies, and indoor cities. Even many (mainly wet, non-coastal ones) subtropical regions can have some bad roads during Winter, but the relatively mild and life-friendly climate with seasons encourages many people to move there.
Maybe when snowy cold snaps happen in those subtropical regions, everything should just shut down until it melts in a few days, or we could have winter tunnels or roofed roads. Or we could just move living/shopping/working into deserts, coastal regions, tropical regions (but no more rainforest cutting), and the subtropical regions that don't snow...
The only reasonable solution is to develop an environmentally friendly road salt. It is neither reasonable or productive to ask cities to shut down in the winter or for people to move, and road salt is an absolute necessity for human health. This is where science comes in to offer improvements.
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