One of the reasons Damon and White get along so well is that they are smart, cerebral men; for them solving the water crisis is a highly intellectual exercise. But I'm curious about the emotional impact. Has Damon ever felt joy in this work?
"That's a funny thing," he says. "There are fewer moments than if I was doing something much more specific at a local level. For me Water.org was always about maximizing impact. But I also have four daughters, and this is an issue for girls. And the people I talk to are girls, and sometimes the same age as my kids. So there is obviously going to be a connection there."