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FORCING = Heat in – Heat out.

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Presentation on theme: "FORCING = Heat in – Heat out."— Presentation transcript:

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20 Table 2.1: A Summary of Key Greenhouse Gases Affected by Human Activities Carbon Dioxide CO 2 Methane (CH 4 )Nitrous Oxide (N 2 O)Chloro-Flouro Carbon (CFC-12) Pre-Industrial280 ppmv700 ppbv275 ppbvzero Concentration Concentration in355 ppmv1,714 ppbv311 ppbv503 pptv in 1995 Recent rate of1.5130.7518-20 concentrationppmv/yrppbv/yr pptv/yr change per year (over 1980s)0.4%/yr0.8%/yr0.25%/yr4%/yr Atmospheric50-20012-17120102 lifetime (yrs)

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