>What cities will survive in 2300. That all depends on whether or not we avoid nuclear annihilation, which is a risk ancient people did not face. In the age o

>What cities will survive in 2300. That all depends on whether or not we avoid nuclear annihilation, which is a risk ancient people did not face. In the age of air travel and superhighways, human beings are much less reliant on waterways than they were in the past (though we are still reliant on them). >What's the biggest city that's unlikely to be underwater? Dallas, Phoenix, Denver? Hard to say which will be larger in 2300.