ABSTRACT
The water availability per capita in the world is constantly changing. A simple explanation would be increasing global population coupled with not a proportionate redistribution in available water decreases the per capita availability of water. With the increase in the global population from 2 billion in 1950 to 6.6 billion current population, for the same water availability, the per capita water availability should have decreased by a factor of 3. However, there are two reasons that this is not true. Firstly, there have been a greater than X3 population increase in certain areas (example: India and China) and secondly, in many regions of the world, the groundwater is a predominant source of water and this is being exploited and is just beginning to run out (example the High Plains of the United States). The United Nations UNESCO (2006) report on Water outlines all possible con-
cerns over the availability of adequate amount and quality of water for human use. It is impossible to fathom the dire consequences that would befall us if we did not immediately involve ourselves with many conservation practices to safeguard this very important resource. This concept of sustainability is explained eloquently in Varady et al., 2008 which deal with water resources planning and principles of efficient management. At times the challenge of being “green’’ comes at a severe cost to water resources (Rockstrom et al., 2007) and therefore any future program in sustainability and “green’’ technology should include water resources in evaluation.
