This unique addition to reference literature provides an introduction to the major concepts and contemporary issues that are essential for students of environmental science and environmental studies to know. With over 200 entries authored by world-class names like Anthony Brazel, John Day and Edward Keller, this text is divided into six sections: Environmental Science, Environments, Paradigms & Concepts, Processes & Dynamics, Scales & Techniques, and Environmental Issues.  

Water Resources

Water resources

Water resources are those sources of water that are accessible for human use including for agriculture (more than 70% of water consumed with most for irrigation and livestock), industry (c. 20%), domestic (c. 6%) purposes. Just a small portion of the water in the world hydrological cycle (approximately 0.08%) is available for water resources. After use some water is returned to the environment whereas some is incorporated into products. Some parts of the world have more water available than others, and the demand for water is increasing (tripled during the second half of 20th Century, and agriculture could require 20% more by 2020), possibly by as much as 40% in the next 20 years. Therefore the potential water shortage, together with global warming, ...

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