that we need to mitigate this problem, that we need to take actionsns now to avert t those catastrorophic futureses, potential futures. >> many people believe that truth will prevail over time. but do we have enough time left? >> so there's an urgency to this problem now unlike any time in the past. and there is still time e to avert catastrophe. ththat's ththe good news. thehed news is there isn't a whole lot of time. and what it means is we don't have another 5 or 10 years to debate e in our u.s. congress whether or not climate e change exists. we e have to be debating right now what we're gonna do ababout it. >> michael mann, thank you very much. [drum beats, animals calalling] emcee: ladieses and gentlemen, please welcome a author, activi, and entrepreneur paul hawken. [cheering] hawken: hi. ha ha! nice to see you, too. my god. i--i was--i was talking to janine backstage, andnd i was saying, "you know, this is the one audience where we actually get nervous." [laughter] and i think it's--we--i don't know. she'll finish the discussion, but it's because you guys