简介：《地球大纪行》是由NFB、NHK、Discovery和科学频道联合制作的一部5集的系列 地球在她超过40亿年的历史中，不断的重复着剧烈的气候变迁，导致了物种的成批的灭绝，然而生命仍在延续。 事实上，这些毁灭地球上生物的相同的灾难同时也推动了物种的进化——从最简单的微生物到现存的复杂丰富的物种。 通过让人身临其境的摄影、采访最前沿的科学家和先进的电脑科技，《地球大纪行》再现地球进化的深奥和扣人心弦的神秘故事，揭示剧变在物种进化过程中扮演者一种奇异的角色。 1.狂暴过去TheViolentPast:SecretsofourPast Earthwasbornasaresultofrepeatedasteroidcollisions,themooncreatedbyasinglegiantimpactevent.Then,Earth'ssizeattractedhugemeteorites,whichslammedintoit,causingsuper-high-temperaturerockvaportocovertheentiresurfaceandevaporatealloceanwater.Theearliestlife-formssurvivedsuchinfernaleventsbyescapingdeepintotheground,miraculouslyemergingagainandagain. TheEarthhasgonethroughinnumerablecatastrophicevents,andlifehassurvivedbyacquiringnewabilitiestolivethrougheachcrisis.Humansarepartofthegrandhistoryoflife'sevolution,whichhasbeencloselyintertwinedwithrepeatedcataclysmicevents.WhywasEarthabletoevolveintoalivableplanet,butnotMars,whichfailedtoholditsatmosphereandoceans?Findoutintheopeningepisodeoftheseries. 2.冰雪地球:SnowballEarth:FirstComplexLife Thehypothesis"SnowballEarth"explainsthaticeages,causedbytheearliestlife-forms,resultedinanevolutionalleap—larger-sizedlife.AtmosphericmethanecreatedbymicrobesinitiallykepttheEarthwarm.Asmicrobesthatproduceoxygen(photosynthesizers)emerged,atmosphericmethanewaslowered.AsaresultEarthcooledandtheprimevaloceanfrozeto1,000metersdeep. Mostlifemayhavebecomeextinctduringalongperiodofintenseglaciationbelievedtohavelastedseveralmillionyears.However,somelifesurvived,perhapsinpuddlescreatednearvolcaniccraters.Carbondioxideaccumulatedintheairbecausethickicesheetspreventedoceanwaterfromabsorbingit.Agreen-houseeffect,createdbycarbondioxide,finallymeltedtheiceandfedphotosynthesizers. Hyperhurricanesragedafterthegreatmeltdownandstirreduptheoceanwater,creatinganidealconditionforlifetoprosperanddevelopcollagen.Usingcollagen,life-formswereabletobuildlargerbodies,andavarietyofcreatures,calledEdiacarabiota,emergedforthefirsttime. 3.新边界NewFrontiers:OntotheLand Earthprovidesarichenvironment,andmanyfactorscontinuallyshapetheplanet'scondition. 4.Extinction.and.Rebirth 5.Survival.of.the.Fittest…