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Phanerozoic CO2 atmospheric levels: There is a clear reduction of CO2 levels leading some to think CO2 has a tendency to disappear from Earth's atmosphere. The main reason is CO2 is stored by the biosphere forming limestone, CaCO3. The cyclic pattern is related with the tectonic cycles, named the Wilson Cycle, wich has formed two super continents during ...


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The answer is The Carbon Cycle, which includes carbon cycling between atmosphere and oceans, vegetation and soils ensure the Earth does not run out. Volcanoes add very little in proportion to Plant Respiration or Soil Decomposition or Ocean Loss (or even fossil fuel burning) - but unlike those, volcanic CO2 (and similarly, fossil fuel CO2) is not accompanied ...


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