We would have to create infrastructure for AC-based indoor living in the entire region and beyond on a grand scale, or only for some and see the rest of the population live in a vegetative state during much of the year. If climate change and the predictions are real anything less is futile. Basically, the entire region is becoming Arizona - without AC for most people, much higher humidity directly at the Gulf, with even less freshwater and many more people who also are much poorer.
Just a dark thought: Maybe there simply is no solution. The climate problem is independent of all the human problems, so solving them, already seemingly impossible, would not even help much with this new issue growing stronger.