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Water is one of Earth's finest elements, and preserving water is essential to healthy living. Don't leave the tap running while you shave or brush your teeth. Water is scarce not only in countries with hot climates, but also in semi-arid States and during hot seasons in general. According to the Ecological Society of America, urbanization, global warming and population growth will put such a strain on resources during the next half century that there will be less fresh water available per person.