The impacts in natural environment is one of the most significant effects of Urbanisation. Soon in the future, if urbanisation continues rapidly and the demand on natural resources such as land and water is still high, our world would be in a complete desolation as people need natural resources such as clean water, trees and hills to survive. Without these, human survival will be difficult and a decline in population is likely to happen. This is part of Outsights 21 Drivers for the 21st Century ™, a future-orientated scan of the 21 key forces shaping this century.