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The amount of CO2 in a given area fluctuates depending on the number of deciduous trees in the area. CO2 can stay in the atmosphere between 300 to 1000 years. Were closer to controlling the amount of methane that gets into the atmosphere, which can stay there between 7 to 12 years. Clay absorbs methane, fortunately zeolite clay, the most absorbent is relatively plentiful and scientists are working to improve it. Therefore cow farts really do cause climate change.
Hope this helps.