L'efecte hivernacle
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El gas que més actua en l'escalfament global de la terra és el vapor d'aigua. L'efecte hivernacle és un fenòmen natural amb el que gràcies a ell la terra manté una temperatura d'entre 15-20 ºC de mitjana, ja que si aquest no existís ens trobariem a una temperatura de -18ºC aproximadament. Els gasos que més hi afecten, a part del vapor d'aigua, són principalment el dioxid de carboni i el metà. El que passa és que els altres gasos més importants de l'efecte hivernacle són provocats majoritariament per l'acció humana de manera que nómes es parla d'aquests.
El vapor d'aigua el que fa és retenir calor; cuant els raigs UV incideixen sobre les partícules d'aigua aquestes es discocien i al mateix moment alliberen calor, la qual s'emet a l'atmosfera augmenta les concequències de l'efecte hivernacle.
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