There is a message that former Vice President Al Gore wants to spread about global warming. He repeats it often in the new documentary "An Inconvenient Truth," in his book of the same name coming out on June 13 from Rodale Books and in the multimedia presentation that he has delivered as the Johnny Appleseed of climate crises more than 1,000 times since leaving office. "(Global warming) has steadily risen over the last four decades to be, by far, the most important challenge that we face," he says. "I believe that it is a planetary emergency, and now the debate is over. The consensus is in. It's real. We're causing it. The effects are really bad. We can fix it. It is not too late." Pam Grady reports.