It is getting cramped on earth. World population is growing by 2.5 people per second. Our planet has more than 7.5 billion inhabitants. By 2050, it will be about ten billion. This is a good reason to think about the future of our resources and common life together. It is also an incentive to try out today innovative architectural concepts which could solve tomorrow's problems: such as an energy-self-sufficient community and a fully self-supplying eco-village.