How Carbon dioxide is produced on Earth
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Fossil fuels are created when ancient plant and animal material is buried, transformed, and preserved in sediments over a long period of time (millions of years). As these fuels are recovered and burned, the carbon within them is released, combining with the oxygen in the air to create carbon dioxide.
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Carbon dioxide emissions can be produced through natural and human activities. ... However, natural sources of carbon dioxide such as animal and plant respiration, volcanic eruptions, and thawing permafrost also contribute to CO2 concentrations in the atmosphere.
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