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ThesceneintheHollywoodmovieTheDayAfterTomorrow,whenglobalwarmingcouldsoonturntheglobalclimate(气候)intoanewiceage,mayneveroccur,accordingtonewresearch.

Thenexticeagecouldbe15,000yearsaway,sayEuropeanscientistswholastmonthannouncedacontinuousrecordof7.40,000yearsofclimatedata(数据)obtainedfromtheAntarcticice.

Scientistsfrom10nationshavenowalmostcompletelydrilledthrougha3,000-meter.depthoficehighintheAntarcticmainland.Theyfigureoutthattheareawheresummertemperaturescanfallto－40℃,hasatleast900,000yearsofsnowfalls,keptasneatlyasthegrowthringsofatree.Andtheiceandaircaughtineachlayer(℃层)havebeguntoanswerquestionsabouttheclimatesinthepast.

Theresultsshowthattherehavebeeneighticeagesinthepast740,000yearsandeightwarmerperiods.Andbycomparingthepatternofglobalconditionstodaywiththoseofthepast,theresearchersreportedinNaturethatthepresentwarmperiodcouldlastanother15,000years.

Researchsuggeststhatthereisaverycloseconnectionbetweengreenhousegaslevelsandglobalaveragetemperatures.Italsoshowsthatcarbondioxide(二氧化碳)levelsarethehighestforatleast440,000years.

“Ifpeoplesaytoyou:thegreenhouseeffectisagoodthingbecausewewouldgointoaniceageoth.0pt189.0erwise,ourdatasayno,anewiceageisnothangingoverourheads,”saidEricWolfffromtheBritishAntarcticSurvey.“Nowwehaveeightexamplesofhowtheclimategoesinandoutoficeages…andyoucanlearnwhattherulesarethatgointotheclimatemodelsthattellusaboutthefuture.”

Scientistsfoundthatwhenevertemperaturesroseinthefrozenrecord,sodidcarbondioxidelevel.“In440,000yearswehaveneverseengreenhousegasgetasthickasitistoday,”saidDrWolff.