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Unformatted text preview: 1 What does the future hold? We are carrying out a global experiment... 755 753 Atmospheric CO2 Concentrations Last glacial maximum (20 ky ago) 200 ppm 1700 AD (pre-industrial) 280 ppm 2006 AD (today) 380 ppm Vostock CO2 and T 744 Carbon Cycle 2 Global Warming? Fossil Fuel Use: C + O2 = CO2 (combustion) About 50% of CO2 released since 1800 has remained in atmosphere. About 25% is in oceans. Rest has probably gone into tree growth or plant debris in sediments. Effect on temperature? About 0.5C warming since 1940 Is this noise or clear signal of more to come? Temperature data Solid lines are 5 year means 1400 - 2000 AD Records from ice cores, tree rings, direct measurement Compilation by NOAA Global Average Possible effects of global warming Sea level rise of 60-70 m as icecaps melt. (during last glacial it was 120 m lower than today) More hurricanes predicted by global models Change climate zones and prime agricultural regions Insects may have larger range - more disease spread?...
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This note was uploaded on 11/30/2010 for the course GEOL 125Lxg at USC.