In 2008, half of the population will live in towns, more than three billion people.
Consequences of the increase in the world population
In 30 years, they will be 9 billion human beings on Earth
Facing new challenges
Cities and their suburbs will expand and take up more and more space which is currently reserved for agriculture or forests. Old districts will have to be adapted to take modern traffic, and we will have to meet increased demand for energy and drinking water, to be able to deal with enormous volumes of wastewater and waste, and to provide transportation solutions.