UnitedNationsFrameworkConventiononClimateChange"(UNFCCC)inthefirstparagraph,thewords"climatechange"isdefinedas:"Afteraconsiderableperiodoftimeofobservation,inadditiontonaturalclimatechangebyhumanactivities,eitherdirectlyorindirectlycausedbychangesinglobalatmosphericcompositionofclimatechange。
"UNFCCCwillthereforebearesultofhumanactivitieschangetheatmosphericcompositionofthe"climatechange"andattributedtonaturalcauses"climatevariability"todistinguish。
Climatechange(climatechange)aremainlymanifestedinthreeareas:globalwarming(GlobalWarming),acidrain(AcidDepostion),ozonedepletion(OzoneDepletion),inwhichglobalwarmingismankind'smostpressingproblemsrelatedtohumanFuture!
Causedbyclimatechange,whatarethereasons?
Climatechangemaybeduetonaturalinternalprocessesorexternalforcing,orartificiallysustainedcomponentsoftheatmosphereandland-usechange。
Bothnaturalfactors,butalsosomeofthefactors。Intheman-madefactors,mainlyduetohumanactivitiessincetheIndustrialRevolution,especiallytheprocessofindustrializationindevelopedcountriescausedbyeconomicactivities。
Fossilfuelburninganddeforestation,land-usechange,greenhousegasemissionsfromhumanactivitiesledtoasubstantialincreaseinatmosphericgreenhousegasconcentrations,enhancethegreenhouseeffect,causingglobalwarming。
AccordingtotheU。S。OakRidgelaboratorystudiesreportthatsince1750,globalcumulativeemissionsofmorethan1trilliontonsofcarbondioxideemissionsindevelopedcountrieswhichaccountforabout80%。
Whataretheimplicationsofclimatechangewillbring?Climatechange,leadingtofrequentcatastrophicweatherevents,acceleratedmeltingofglaciersandsnowcover,waterdistributionimbalances,biodiversityisunderthreat。
Climatechangeisalsocausedbysea-levelrise,coastalareassubjecttofloods,stormsandothernaturaldisastersisevenmoreserious,smallislandstatesandlow-lyingcoastalareasevenfacingthethreatofbeingsubmerged。
Ofclimatechangeonagriculture,forestry,animalhusbandry,fisheryandothereconomicandsocialactivitieswillhaveanegativeimpact,exacerbatingthespreadofdisease,threateningthesocio-economicdevelopmentandpeople'shealth。
AccordingtotheIntergovernmentalPanelonClimateChangereport,iftemperaturesrisebymorethan2。5℃,allregionsarevulnerabletotheadverseeffectsofthelosssufferedparticularlysevereindevelopingcountries;iftemperature4℃,theglobalecosystemmaynotcauseanyirreversibledamage,causingheavylossestotheglobaleconomy。
AccordingtoChinain2006"issuedbyNationalAssessmentReportonClimateChange,"theimpactofclimatechangeonChina'sfocusonagriculture,waterresources,naturalecosystemsandcoastalzones,etc。
,mayleadtoincreasedinstabilityinagriculturalproduction,floodingthesouthernregionheavierthenorthintensifiedconflictsbetweenwatersupplyanddemand,forestandgrasslandecosystems,suchasdegradation,biologicaldisastershair,reductionofbiodiversity,frequenttyphoonsandstormsurges,coastalzonedisasterintensifiedonmajorprojectconstructionandoperationofsecurityhasbeenaffected。
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