Re: Why are there only two cities in the future? (spoilers)
Whatever befall some of the cities of Earth in the 21st century, it probably wasn't climate change. Florida looks fabulous in the mid-22nd century.
According to the latest calculations, our Florida will be flooded by the rising sea waters, and, by the mid-22nd century, what was a state will be an archipelago of crumbling buildings. Breakwaters aren't going to save Miami - it sits on a porous limestone foundation.
That's okay. The Miami Heat will STILL be NBA Champions!
"History will be kind to me, for I intend to write it!" - Winston S. Churchill