FORCING = Heat in – Heat out.

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Presentation transcript:

FORCING = Heat in – Heat out

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 of concentrationppmv/yrppbv/yr pptv/yr change per year (over 1980s)0.4%/yr0.8%/yr0.25%/yr4%/yr Atmospheric lifetime (yrs)