You have touched upon some wisdom by one of the greatest thinkers of the twentieth century – Buckminster Fuller when you stated what may be possible.
Mr. Fuller stated that :

"There is no energy crisis – but a crisis of ignorance" ( I will add also a "crisis of greed and self-interest") that permeates most of society!

My belief is that there is going to be a massive shift globally that will see most of the power and water supply utilities world-wide be put out of business by forward-thinking inspired geniuses that will provide cost-effective ways to create clean drinking water and unlimited power to every man, woman and child on this planet for very little cost! What's more I believe it is the right of every human on this planet to have access to these commodities!

This shift in thinking and process will eventually stabilise the worlds population and go a long way in reducing the madness that creates wars.

Masdar City is only a glimpse of what the forward-thinking leaders of the U.A.E. are striving for!!! This may happen within the next twenty to fifty years.

there are ways to survive without air conditionning. This must first start by the adaptation of our so-called needs. Bedouins have survived just fine, and so have we before twenty-four-hour-running centralized air-conditionning systems invaded our offices, homes and malls.

Foster has been experimenting with double-skin facades and other similar low-consumption, low-emission technologies in order to reduce dependance on air conditionning.

So I suggest you take a look around you and see that if the change doesn't start in our mentalities and standards, and unless we become open to new alternative lifestyles, we will drown in our own shit (pardon my french).

ps. I know what heat is, I gew up in Kuwait, and I still think something like this can be made possible.