water is vital to life and to habitat preservation. It is a major component of climate and a determining influence on economic growth and human population patterns. Modern competition for freshwater resources directly relates to the complex history of land use as humans evolved from hunter-gatherers to farmers and to modern agriculturists, industrialists, and members of modern urban communities. Water developments that proliferated during the twentieth century have greatly benefited most aspects of modern life, including public health and safety, agriculture, recreation, and commerce, but at the same time, these water developments have caused many environmental changes (Schilling et al
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