Water fountains are being shown on a massive digital screen, set up along The Strip, Las Vegas, Nevada, USA, as cars and visitors pass by. Lake Mead, on the border between Nevada and Arizona, USA, is the main water provider for Las Vegas, a city of 2 million people, in the middle of southern Nevada desert. It is 180 km long, and when filled to capacity, can reach 28 million acre-feet of water. However, the lake has not reached this capacity in more than a decade, due to increasing droughts.
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