Lake Mead may go dry by 2021

Lake Mead
Reasons: Increased demand for water and climate change. If it does go dry, then Hoover Dam stops producing power and L.A. and Vegas will have severe water shortages.

We were stunned at the magnitude of the problem and how fast it was coming at us,” said Barnett in a statement. “Make no mistake, this water problem is not a scientific abstraction, but rather one that will impact each and every one of us that live in the Southwest.