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A family cools off in the lazy river at Mandalay Bay Beach resort in Las Vegas, Nevada. According to a 2014 report, Las Vegas casinos consume about 3 billion gallons of water per year. Expansive golf courses and massive water parks are popular attractions in many of the thirstiest cities across the American West. From rural communities to large urban centers, much of the West is experiencing severe water shortages, and increased restrictions on water usage. High demand for fresh water coincides with decreasing water resources due to a combination of warmer temperatures, increased water evaporation, dryer soil, and severe droughts.