Cloud Cities is the culmination of the Aerocene. When these structures become large enough (approx 1 mile in diameter) they will be able to carry massive payloads, and remain aloft, as long as the temperature within is one degree warmer than the outside air temperature. Cloud Cities will no longer rely on the power of the Sun and the Earth, but on the simple breathing of the creatures that inhabit it. But Cloud Cities is more than a futurist's dream. It is a commentary and strategy for how humanity can change the way we live together on this planet in the present moment.