name the activities that upset the balance of oxygen in the air ?
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The two main human activities that affect the carbon-oxygen cycle are the burning of fossil fuels and the use and change of land. The burning of fossil fuels removes carbon from coal, natural gas or other fuels and emits that carbon as CO2 into the atmosphere.
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Excessive release of Greenhouse Gases upsets the oxygen balance in the air.
Explanation: Oxygen balance in the air is maintained by release of CO2 by human beings and release of oxygen by plants during photosynthesis
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