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>> reporter: geoff, the hill changes colors because that's the old water line and this used to be under water, used to be lake mead. i'll show you where it sits now. over the last 20 years or so the lake dropped about 130 feet in elevation. due to growing drought that scientists say is a combination of both natural weather patterns and human caused climate change and in may that water level hit below 1,075 feet which set off this first-ever water shortage declaration going to be issued in the next couple of hours by the federal government and means now the water levels below 40 prts and now we will have to see water cuts hitting multiple states starting with arizona, nevada and parts of mexico. parts of 40 million people that rely on water from the colorado river basin and now a scramble