PBS Discussions Discussion Forums on pbs.org    Search   Register   Profile   Ignore List   Log in  Mass Extinction    PBS Discussions Forum Index -> NOVA scienceNOW: Stories 2006 View previous topic :: View next topic   Author Message NOVA scienceNOW1 Moderator Joined: 13 Jan 2005 Posts: 64 Post subject: Mass Extinction    Posted: Tue Oct 31, 2006 11:04 am 250 million years ago, long before dinosaurs or human civilization existed, something triggered Earth's most profound mass extinction and reset the nature of life on this planet. The clues suggest this was not the result of an asteroid impact, like the one that extinguished the dinosaurs much later on. Can scientists find the culprit, and could a situation like that ever happen again? Does it concern you that we seem to be in the midst of another mass extinction—one of our own doing? What should we be doing about it, if anything? Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Subject Author Date/Time Mass Extinction NOVA scienceNOW1 Tue Oct 31, 2006 11:04 am    Re: Mass Extinction waterpartnership Tue Nov 21, 2006 6:10 pm    Re: Mass Extinction greenfeather1 Sat Nov 25, 2006 11:10 am    Re: Mass Extinction EarthPerson Sat Nov 25, 2006 1:30 pm    Re: Mass Extinction itsili Sun Nov 26, 2006 3:15 pm    Re: Mass Extinction morbas Mon Jul 30, 2007 7:07 pm    PBS Discussions Forum Index -> NOVA scienceNOW: Stories 2006   Jump to: Select a forum PBS Active Forums----------------Antiques Roadshow FYIArt21Bill Moyers on Faith & ReasonMASTERPIECE CONTEMPORARY: EndgameMASTERPIECE CONTEMPORARY: Place of ExecutionMASTERPIECE CONTEMPORARY: CollisionMASTERPIECE: The Complete Jane AustenMASTERPIECE: CranfordMASTERPIECE MYSTERY: WallanderMASTERPIECE MYSTERY: Foyle's WarMASTERPIECE MYSTERY: The Inspector Lynley MysteriesMASTERPIECE MYSTERY: PoirotMASTERPIECE MYSTERY: Miss MarpleMASTERPIECE MYSTERY: Inspector LewisNOVA: The Bible's Buried SecretsNOVA: Saved by the SunNOVA: Family That Walks on All FoursNOVA: Parallel Worlds, Parallel LivesNOVA: The Big Energy GambleNOVA: Inside the Spy FactoryNOVA: Doctors' DiariesNOVA: Extreme IceNOVA: Last ExtinctionP.O.V.: Tintin and IWashington WeekMASTERPIECE CLASSIC 2009: Tess of the d’UrbervillesMASTERPIECE CLASSIC 2009: Wuthering HeightsMASTERPIECE CLASSIC 2009: Oliver TwistMASTERPIECE CLASSIC 2009: David CopperfieldMASTERPIECE CLASSIC 2009: Little DorritMASTERPIECE CLASSIC 2009: The Old Curiosity Shop NOVA scienceNOW----------------NOVA ScienceNOW Stories 2009NOVA scienceNOW: DispatchesNOVA ScienceNOW: Stories 2008NOVA scienceNOW: Stories 2007NOVA scienceNOW: Stories 2006NOVA scienceNOW: Stories 2005NOVA scienceNOW: About the new series PBS.org Forums----------------The Rise and Fall of Jim CrowThe Merrow Report: First to WorstPBS Campus Message BoardBeyond Brown: Pursuing the PromiseNot In Our Town: Talk About ItRemembering Julia ChildThe Question of GodBy the People: Deciding VotesWide AngleGet Up, Stand Up: The Story of Pop and ProtestRx for SurvivalMonty PythonIndependent Lens: A Lion in the HouseAIR: America's Investigative ReportsThe Victory GardenIndependent Lens: Knocking NOW----------------NOW: Politics & EconomyNOW: Arts & CultureNOW: Society and CommunityNOW: Ongoing DiscussionsNOW: PollsNOW: Enterprising IdeasNOW: Science and Health NOVA----------------NOVA: Darwin's Darkest HourNOVA: Forgotten GeniusNOVA: Judgment Day -- Intelligent Design on TrialNOVA: Marathon ChallengeNOVA: Car of the FutureNOVA: Car of the Future -- Educators' ForumNOVA: Space Shuttle DisasterNOVA: Car of the Future -- Filmmakers' Forum P.O.V. - Talking Back----------------P.O.V.: 49 UpP.O.V.: Wrestling With Angels: Playwright Tony KushnerP.O.V.: LumoP.O.V.: The Camden 28P.O.V.: Made in L.A.P.O.V.: Libby, MontanaP.O.V.: Arctic SonP.O.V.: A Family UndertakingP.O.V.: The Hobart ShakespeareansP.O.V.: Following SeanP.O.V.: Revolution '67P.O.V.: Kokoyakyu: High School BaseballP.O.V.: Sierra Leone's Refugee All StarsP.O.V.: Rain in a Dry LandP.O.V.: Standing Silent NationP.O.V.: My Country, My CountryP.O.V.: Prison Town, USAP.O.V.: The Chances of the World ChangingP.O.V.: Maquilapolis: City of FactoriesP.O.V.: No Bigger Than A MinuteP.O.V.: Twelve Disciples of Nelson MandelaP.O.V.: The Boys of BarakaP.O.V.: Lomax the SonghunterP.O.V.: Waging a LivingP.O.V.: Al Otro Lado (To The Other Side)P.O.V.: The TailendersP.O.V.: The Fall of FujimoriP.O.V.: No More Tears SisterP.O.V.: Omar & PeteP.O.V.: Hiding and Seeking: Faith And Tolerance After The HolocaustP.O.V.: Bright LeavesP.O.V.: HardwoodP.O.V.: In the Realms of the UnrealP.O.V.: The Self-Made ManP.O.V.: The Brooklyn ConnectionP.O.V.: The Fire Next TimeP.O.V.: Street FightP.O.V.: Big EnoughP.O.V.: The Education of Shelby KnoxP.O.V.: Chisholm '72 - Unbought & UnbossedP.O.V.: Lost Boys of SudanP.O.V.'s Voter Motor Mouth - 2004 Campaign WatchP.O.V.: A Panther in AfricaP.O.V.: Freedom MachinesP.O.V.: WattstaxP.O.V.: SpeedoP.O.V.: Every Mother's SonP.O.V.: Last Man StandingP.O.V.: ThirstP.O.V.: War Feels Like WarP.O.V.: Bill's RunP.O.V.: FarmingvilleP.O.V.: What I Want My Words to Do To YouP.O.V.: Love & DianeP.O.V.: State of DenialP.O.V.: SoldadosP.O.V.: The Sixth SectionP.O.V.: Family FundamentalsP.O.V.: West 47th StreetP.O.V.: American AlohaP.O.V.: 90 Miles (Bridge)P.O.V.: 90 MilesP.O.V.: The Flute PlayerP.O.V.: Discovering DomingaP.O.V.: Larry v. 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