The Pentagon knows that our world is made less stable by millions upon millions of thirsty people dislocated from their homes and livelihoods due to climate damage. In 2014, Secretary of Defense Chuck Hagel said, "We are already beginning to see some of these impacts." In Syria, drought forced millions of people to flee their farms for city streets. Hot, dry and agitated, they needed water. Water to grow food. Water to quench their children's thirst. What they got was civil war.