"Norfolk is at risk over the next few decades if we don't do something to slow down sea level rise," Navy Secretary Ray Mabus told a gathering in Washington, D.C., on Monday. Naval Station Norfolk, the largest naval complex [1] in the world, is located in southeastern Virginia. "All our bases are in some way or other at risk," Mabus said. And that's not the only risk posed by climate change, Mabus said. The warming planet also expands the Navy's mission: "We're the first responders. We're the ones -- the Navy and Marine Corps are the ones sent. We get...