360 Mauna Loa cO? Concentration C02 350 Concentrations 340 at mauna loa, 330 Hawa 310 195519601965197019751980198519901995 YEAR The average atmospheric CO2 concentrations observed at Muana Loa Hawaii increased approximately 40 ppmv between 1958 and 1995 The small fluctuations in the curve are seasonal variations due primarily to the withdrawal and production of carbon dioxide by terrestrial life. Notice that minimum values occur during the northern hemisphere summers(when global photosynthetic activity is greatest) and maximum values occur six months laterCO2 Concentrations at Mauna Loa, Hawaii The average atmospheric CO2 concentrations observed at Muana Loa, Hawaii increased approximately 40 ppmv between 1958 and 1995. The small fluctuations in the curve are seasonal variations due primarily to the withdrawal and production of carbon dioxide by terrestrial life. Notice that minimum values occur during the northern hemisphere summers (when global photosynthetic activity is greatest) and maximum values occur six months later