Last week, Al Gore rocked TED with one of the most electrifying talks on our planet's future you'll ever hear. He asks three questions about climate change: Do we have to change? (Oh, yes we do; stunning stats and some jawdropping footage help make his case.) Second question: Can we change? And here's the surprising part: We've already started. So then, he asks the big question: Will we change? In this challenging, inspiring talk, Gore says yes: "We're going to win this." If you've got climate-change fatigue, feeling helpless and hopeless -- take the time to watch this rousing talk on the state of Earth right now.