DPU Working Paper - No. 133
What Crisis? Challenging the Urban Water Challenge of the Twenty-First Century
20 May 2009
Author: Thomas Wipperman
Publication Date: 2007
Water is a fundamental part of the metabolism of all living things. It is needed in the processes of respiration and photosynthesis, through which living beings are able to transform energy into a useful form to carry out the processes of life. Human beings can, at best, survive three days without water; other organisms can last longer, but ultimately, all will die without new sources of water.