Joe Rothstein: "Within the lifetimes of people now on Earth, fresh water will be seen as a rare treasure"

The Dumbest People on The Planet: U.S. Leaders' Failure to Act on Climate Change - U.S. Politics Today - News Media Monitoring

What I can't understand is how people can have different opinions over scientific facts. I'm thinking now, specifically, about global warming.
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The waters of the North Atlantic are 20 percent less salty than they were in the 1990s because of glacier melt. The surface waters off of Tasmania are 35 degrees f than they were 60 years ago.
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Meanwhile, in North Dakota and on the upper prairie, what they used to call hundred year floods are occurring just about every year. Tennessee just had a 1,000 year flood. Dams built in California to catch spring mountain snow runoff are being threatened by increasing precipitation triggered by rising temperatures.
...Within the lifetimes of people now on Earth, fresh water will be seen as a rare treasure.