And Humanity is not distributed evenly over Earth's surface. While in some areas population density is as low as 1 person per square kilometer, in other areas density exceeds already today 500 people per square kilometer. Often, these high density is found in regions that already today cannot sustain the population with water, food, and other resources.

Expressing population grows in population doubling times helps us understanding the full dimension of the challenge humanity faces. In some countries, doubling times are as low as 15 years. It must be obvious to everybody that combining the low doubling times with centers of high population density, as is the case in several "hot-spot" areas, will lead inevitably to an unsustainable situation in the near future, where the population in these hot-spots face only two choices: either to die or to migrate to regions with less people and more resources. The tension and conflicts arising from this rapidly developing social disaster are a threat to the stability and sustainability of our global civilization.