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Hva er årsakene til global oppvarming?
Global oppvarming er økende på den gjennomsnittlige temperaturen på jordens overflate. Siden slutten av 1800 globale gjennomsnittstemperaturen økt fra 0,4 til 0,8 grader. Ifølge beregninger gjort av mange eksperter, vil den gjennomsnittlige temperaturøkningen innen 2100 være mellom 1,4 og 5,8 grader. Øke hastigheten kan væremye mer enn tidligere økning priser.
Forskere er opptatt av at det menneskelige fellesskapet og naturlige økosystemet ikke kan tilpasse seg en raske klimaendringer. Et økosystem består av et privat område, levende organismer og fysiske miljøet. Global oppvarming kan forårsake mye skade, så alle verdenland har utarbeidet traktaten av Kyoto-protokollen for å begrenseden.
Årsaker til global oppvarming
Globale klimatologer (forskere i klima vitenskap) har analysert den globale oppvarmingen som har skjedd siden slutten av 1800-tallet. Fleste climatologists har besluttetat mennesker er ansvarlig for en stor mengde oppvarming. Menneskelig aktivitet bidrar til global oppvarming ved å øke den naturlig drivhuseffekten på jorden. Drivhuseffekten varmer overflaten av jorden med en komplisert prosess som omfatter sollys, gasser, partikler i atmosfæren. Klimagasser er navnet gitt til gasser fanget i jordens atmosfære. (Den mest skadelige klimagassen er karbondioksid. Kyoto-avtalen spårutgivelsen av karbondioksid, samt redusere utslipp av metan og lystgass gasser.)
De viktigste menneskelige aktivitetene bidra til global oppvarming er ødeleggelsenav fossilt brensel (kull, olje og naturgass) og avskoging. De fleste drivstofforbruk: det skjer i biler, fabrikker, kraftverk. Karbondioksid gass (kjemisk formel CO2) er avslørtav forbrenning av fossilt brensel. CO2 er en drivhusgass som bremser resultatet av varmen i verdensrommet. Trær og andre planter bruke CO2 i luften for å produsere næringsstoffer bruker fotosyntese. Ødeleggelse av skog bidrar til spredning av CO2 ved å redusere gass ødelagt av planter eller nedbryting av død vegetasjon.
En liten mengde forskere si klimagasser ikke har gjort målbare endringer i temperatur. De sier at min naturlig formasjon kan føre til global oppvarming. Disse formasjonene inkluderer øker i energien som slippes ut fra solen. Men det store flertallet av klimatologer tror at økningen i solenergi har en veldig liten effekt på global oppvarming.
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