Fig. 5.3.2. Changes in the 02 concentration and its dependence on C02. When fossil fuels are burnt 02 consumption is proportional to the C02 released. However, C02 is absorbed by the oceans (without releasing an equivalent amount of 02) and by photosynthesis (where 02 is simultaneously produced). These three processes result in the changes in measured 02 and C02. (After Keeling et al. 1996)

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