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env100 note 47.docx

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ENV100 Lecture NotesFeb 15 2012 Climate Change continuedReading Chapter 14To summarize what is knownEarths climate changes naturally on a variety of time scales as a result of internal forcing greenhouse effect and external forcingAtmospheric chemistry has changed as a result of human activity o Both amounts and types of GHGs have changedChanges in atmospheric chemistry will have impacts on the global climate systemPhysical and biological impacts will in turn have socioeconomic consequencesWhat is probableGlobal mean surface temperature will increase 1C to 3C or as much as 7C in some stregions by the middle of the 21 centuryMean sea level will rise by 10 to 30 cm by the year 2050Rate of water evaporation will increase resulting in increased global mean precipitationPhenomenon and L
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