简介：Inrecentyears,Chinahaslaunchedactiveexplorationandpracticesintheaspectsoftheconstructionofecologicalcivilizationandhasmaderemarkableachievements.Inthisprocess,enterpriseshaveplayedanimportantroleinoptimizingtheeconomicgrowth,promotingenergy-savingandemissionreduction,andspreadingecologicalculture.ThepaperanalyzesthepresentsituationandexistingproblemsofcurrentconstructionofecologicalcivilizationofenterprisesinChina.OnthebasisofcurrentsituationoftheconstructionofecologicalcivilizationofenterprisesinBeijingandinlinewiththeindustrialstandardofCRISP-DM,thepaperutilizesdecisiontreealgorithmandresearchesthekeyelementswhichinfluencetheenterprises’willingnessoftheconstructionofecologicalcivilization.Theresearchresultshowsthattherearethreekeyelementswhichinfluencetheenterprises’willingnessoftheconstructionofecologicalcivilization:enterprises’averagesalesofthepastthreeyears,thecategoriesofenterprisesandenterprises’principals’cognitionontheresponsibilityoftheconstructionofecologicalcivilization;othertwovariableshavenoinfluenceonthewillingness:therationofresearchandconstructionstaffinenterprisesandthatwhetherenterprisesarehigh-techones.Therefore,itisnecessarythatgovernmentsshouldtaketheleadtoestablishstrongconceptionofecologicalcivilizationamongcitizens,carryoutvigorouslythepublicityandeducationoftheconstructionofecologicalcivilization,enhancethecognitionlevelsofenterprises’principalsandreducethecostsoftheconstructionofecologicalcivilization.

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简介：Thetotal15severedroughtsarediscoveredwiththeaidofthe'RetrievalSystemofChineseHistoricalClimateRecords'forthelast1000years.Thedroughtsareextensivetoenvelopemorethan4provincesandpersistenttocover3yrormore,andtheirseverityisequivalenttoorinexcessofthatinthe1930sinChina.Accordingtothedocumentaryrecordsandrestorationsitcanbeinferredthatmostdroughtsaremoreseverethanthoseinthelast50years.The15droughtsmayeitheroccurwarmorinacoldclimatebackground,with11ofthe15casesinthecoldphase.ThisindicatesthedifferenceinclimatecorrespondencebetweenChinaandnorthernAmerica,showingtheseverityoftheeventsinChinatobeinacoldinsteadofawarmclimatesituation.ThatislikelytorelatetothemonsoonclimateineasternAsia.

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