"I guess the thing I've spent more time on than anything else in this slide show is trying to identify all those things in people's minds that serve as obstacles to them understanding this. And whenever I feel like I've identified an obstacle I try to take it apart, roll it away, move it, demolish it, blow it up. I've set myself a goal: communicate this real clearly. The only way I know to do it is city by city, person by person, family by family, and I have faith that pretty soon that enough minds are changed that we cross a threshold."