Living in the Environment 18th Edition by Tyler Miller,Scott Spoolman

Exercise 21

What is reliable surface runoff What percentage of the world's reliable runoffare we using and what percentage are we likely to be using by 2025 How is most of the world's water used Define and give an example of a water footprint. Define virtual water and give three examples of it. Describe the availability and use of freshwater resources in the United States and the water shortages that could occur during this century. What are four major problems resulting from the way people are using water from the Colorado River basin