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This document discusses the sustainability of the global water supply. It notes that the world's population tripled in the 20th century while water usage grew six times. By mid-century, an additional 3 billion people will need water, most in already water-stressed countries. Ensuring a sustainable water supply will require improving conservation efforts, embracing alternative water sources like reuse and desalination, and designing systems with conservation and full water costs in mind. Without changes to prioritize sustainable water practices, a global water crisis may be unavoidable.Read less