If you wait to see people fleeing it's way too late to act. Just imaging how many DECADES would be needed to design and built a new "modern polis", adapted to o

If you wait to see people fleeing it's way too late to act. Just imaging how many DECADES would be needed to design and built a new "modern polis", adapted to our present and future needs, so renewables, flying logistic, much more rails for heavy packages, future flying "cars" and so far. Of course this meanwhile the climate change push people a bit northern/southern BUT the need of renewables and low energy consumption do not push MUCH at north/south, so available land prices jumping crazy, new infra need to be built but there is no global agreement nor long consolidated infra in place to follow and so on. Such change demand AT LEAST a century, so you need to start planning a century before and keep evolving at slow peace correcting anything going wrong on the road. It's not something that can be done like building a new gear in a factory.