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1、自然灾害对人类活动的影响（Theinfluenceofnaturaldisastersonhumanactivities）TheinfluenceofnaturaldisastersonhumanactivitiesNaturaldisastersrefertoaseriesofeventssuchascasualties,propertylosses,socialinstability,resourcedestructioncausedbyabnormalchangesinnature.Itsformationmusthavetwoconditions:oneistohav
2、eanaturalchangeasanincentive,twoistohavedamagetopeopleandproperty,resourcesastheobjectofdisasterbearing.Thenaturalvariationontheearth,includingthenaturalvariationinducedbyhumanactivities,ishappeningallthetime.Whenthiskindofvariationbringsharmtohumansociety,itconstitutesnaturaldisaster.Disas
3、tershavenegativeordestructiveeffects.Naturaldisasterisaformofcontradictionbetweenmanandnature,whichhasdualnatureofnatureandsociety.Itisoneofthemostseriouschallengesfacedbyhumanbeingsinthepast,presentandfuture.Atpresent,thenaturaldisastershavecausedgreatattention,manykindsofworldmajorunexpec
4、tednaturaldisasters,includingdrought,flood,typhoonandstormtide,frost,hail,tsunami,earthquake,volcano,landslide,debrisflow,forestfires,agricultureandforestrypestsetc..Thebackgroundandreasonsofglobaldisasters,aglobalwarmingistheprofoundinfluenceoflong-termtrendofdisastercausingfactors;twoisdu
5、etoincreasedvulnerability,resilienceofrelativedeclineasaresultofhumansocialdisaster.Naturaldisastersinevitablyhavedisastercausingfactors.Thedisastercausingfactorsincludenaturaldisastercausingfactorsandman-madedisastercausingfactors.Naturaldisastersaremainlycausedbynaturalandman-madereasons.
6、Here,we'regoingtofocusonmajorworldclassdisasters,globalwarming.Globalwarmingwillhavecomplexandpotentialimpactsontheearthandhumanbeings,bothpositiveandnegative.Forexample,withtheincreaseoftemperatureinthesubpolarregions,maybemoresuitableforhumanhabitation;underappropriateconditions,ahigherco
7、ncentrationofcarbondioxidecanpromotephotosynthesis,sothatplantshaveahigherrateofcarbonsequestration,resultingintheincreaseofvegetationgrowth,namelycarbondioxideproductioneffect.Thisisthepositiveimpactofglobalwarming.Thenegativeimpactofglobalwarmingonhuma
