Astounding ten-year photo comparison of two of the world's largest reservoires

Interesting comparisons are being made between the largest reservoires in Central Asia and in the US.  Satellite photos a few years apart are horrifying.

Lake Mead, the largest reservoir in the US, has dropped 150 feet - 5.6 trillion gallons - since 2000. According to officials, if it drops another 50 feet, Hoover Dam will cease to produce power.