Resource Wars: Water in the South

I get an email called something like "The Homeland Security Daily Wire" every day at work. One topic in yesterday's email was the drought in the south. It showed up again in the paper today - in an AP article, so it's probably in everyone's paper today.

Climate change is going to redistribute resources. At this point, at least in the American south today, we're dealing with it in the courts. But what happens when if whole communities run out of water?

What kind of long-term thinking do we need to do now to manage this kind of issue globally?