朱星宇的回答：

GlobalwarmingistheincreaseintheaveragetemperatureoftheEarth'snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation. Globalsurfacetemperatureincreased0.74±0.18°C(1.33±0.32°F)duringthe100yearsendingin2005.[1][2]TheIntergovernmentalPanelonClimateChange(IPCC)concludesthatmostofthetemperatureincreasesincethemid-twentiethcenturyis"verylikely"duetotheincreaseinanthropogenicgreenhousegasconcentrations.[3][2]Naturalphenomenasuchassolarvariationandvolcanoesprobablyhadasmallwarmingeffectfrompre-industrialtimesto1950andasmallcoolingeffectfrom1950onward.[4][5]Thesebasicconclusionshavebeenendorsedbyatleast30scientificsocietiesandacademiesofscience,[6]includingallofthenationalacademiesofscienceofthemajorindustrializedcountries.[7][8][9]Whileindividualscientistshavevoiceddisagreementwiththesefindings,[10]theoverwhelmingmajorityofscientistsworkingonclimatechangeagreewiththeIPCC'smainconclusions.[11][12] Climatemodelprojectionsindicatethatglobalsurfacetemperaturewilllikelyriseafurther1.1to6.4°C(2.0to11.5°F)duringthetwenty-firstcentury.[3]Theuncertaintyinthisestimatearisesfromuseofdifferingestimatesoffuturegreenhousegasemissionsandfromuseofmodelswithdifferingclimatesensitivity.Anotheruncertaintyishowwarmingandrelatedchangeswillvaryfromregiontoregionaroundtheglobe.Althoughmoststudiesfocusontheperiodupto2100,warmingisexpectedtocontinueformorethanathousandyearsevenifgreenhousegaslevelsarestabilized.Thisresultsfromthelargeheatcapacityoftheoceans.[3] Increasingglobaltemperaturewillcausesealevelstoriseandwillchangetheamountandpatternofprecipitation,likelyincludinganexpanseofthesubtropicaldesertregions.[13]Otherlikelyeffectsincludeincreasesintheintensityofextremeweatherevents,changesinagriculturalyields,modificationsoftraderoutes,glacierretreat,speciesextinctionsandincreasesintherangesofdiseasevectors. MostnationalgovernmentshavesignedandratifiedtheKyotoProtocolaimedatreducinggreenhousegasemissions.Politicalandpublicdebatecontinuesregardingwhat,ifany,actionshouldbetakentoreduceorreversefuturewarmingortoadapttoitsexpectedconsequences.

贾继海的回答：

GlobalwarmingistheincreaseintheaveragetemperatureoftheEarth'snear-surfaceairandoceanssincethemid-20thcenturyanditsprojectedcontinuation. Globalsurfacetemperatureincreased0.74±0.18°C(1.33±0.32°F)duringthe100yearsendingin2005.[1][2]TheIntergovernmentalPanelonClimateChange(IPCC)concludesthatmostofthetemperatureincreasesincethemid-twentiethcenturyis"verylikely"duetotheincreaseinanthropogenicgreenhousegasconcentrations.[3][2]Naturalphenomenasuchassolarvariationandvolcanoesprobablyhadasmallwarmingeffectfrompre-industrialtimesto1950andasmallcoolingeffectfrom1950onward.[4][5]Thesebasicconclusionshavebeenendorsedbyatleast30scientificsocietiesandacademiesofscience,[6]includingallofthenationalacademiesofscienceofthemajorindustrializedcountries.[7][8][9]Whileindividualscientistshavevoiceddisagreementwiththesefindings,[10]theoverwhelmingmajorityofscientistsworkingonclimatechangeagreewiththeIPCC'smainconclusions.[11][12] Climatemodelprojectionsindicatethatglobalsurfacetemperaturewilllikelyriseafurther1.1to6.4°C(2.0to11.5°F)duringthetwenty-firstcentury.[3]Theuncertaintyinthisestimatearisesfromuseofdifferingestimatesoffuturegreenhousegasemissionsandfromuseofmodelswithdifferingclimatesensitivity.Anotheruncertaintyishowwarmingandrelatedchangeswillvaryfromregiontoregionaroundtheglobe.Althoughmoststudiesfocusontheperiodupto2100,warmingisexpectedtocontinueformorethanathousandyearsevenifgreenhousegaslevelsarestabilized.Thisresultsfromthelargeheatcapacityoftheoceans.[3] Increasingglobaltemperaturewillcausesealevelstoriseandwillchangetheamountandpatternofprecipitation,likelyincludinganexpanseofthesubtropicaldesertregions.[13]Otherlikelyeffectsincludeincreasesintheintensityofextremeweatherevents,changesinagriculturalyields,modificationsoftraderoutes,glacierretreat,speciesextinctionsandincreasesintherangesofdiseasevectors. MostnationalgovernmentshavesignedandratifiedtheKyotoProtocolaimedatreducinggreenhousegasemissions.Politicalandpublicdebatecontinuesregardingwhat,ifany,actionshouldbetakentoreduceorreversefuturewarmingortoadapttoitsexpectedconsequences.