UnitedNationsFrameworkConventiononClimateChange(UNFCCC)inthefirstparagraph,thewordsclimatechangeisdefinedas:Afteraconsiderableperiodoftimeofobservation,inadditiontonaturalclimatechangebyhumanactivities,eitherdirectlyorindirectlycausedbychangesinglobalatmosphericcompositionofclimatechange。
  UNFCCCwillthereforebearesultofhumanactivitieschangetheatmosphericcompositionoftheclimatechangeandattributedtonaturalcausesclimatevariabilitytodistinguish。
  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℃,theglobalecosystemmaynauseanyirreversibledamage,causingheavylossestotheglobaleconomy。
  AccordingtoChinain2006issuedbyNationalAssessmentReportonClimateChange,theimpactofclimatechangeonChina'sfocusonagriculture,waterresources,naturalecosystemsandcoastalzones,etc。
  ,mayleadtoincreasedinstabilityinagriculturalproduction,floodingthesouthernregionheavierthenorthintensifiedconflictsbetweenwatersupplyanddemand,forestandgrasslandecosystems,suchasdegradation,biologicaldisastershair,reductionofbiodiversity,frequenttyphoonsandstormsurges,coastalzonedisasterintensifiedonmajorprojectconstructionandoperationofsecurityhasbeenaffected。