Carbon accumulation 370 0.45 Temperature、 350 0.30 340 0.15 30 cO2 320 0.15 0.30 1960 1965 1970 1975 1980 1985 1990 1995 Year 91999 Addison wesley Longman, ir CO, has increased from its pre-industrial level 66 Carbon accumulation • CO2 has increased from its pre-industrial level