The current estimates of annual flux of carbon from forested ecosystems suggest that there is a net increase in atmospheric CO2 containing about 700 million tonnes of carbon. This implies that the loss of carbon from the global forest ecosystems is associated with an annual sequestration of about 1.9 billion tonnes of atmospheric Oxygen. However, the residence time of the atmospheric carbon dioxide is about 120 years, and possibly less. This is to say that in the longer term, the system has no O2 stress due to carbon emissions, and as such oxygen will most likely not be a problem to future generations either. regards, makundi
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