Keith says that when he mentioned onstage at his July 6 show in Dallas that he would be playing the following day at Live Earth, a worldwide series of concerts to raise awareness about the issue, some fans booed. “It took me by surprise, because I realized that a lot of people still see this as a political issue,” he says. “Which is absolutely insane. . . . It's really hard for me to think that some people can still deny that we're in crisis.”