The Carbon Cycle Coloring Pages

In the extremely far future (i. e, 2-3 billion years), the rate at which carbon dioxide is absorbed into the soil via the carbonate–silicate cycle will likely increase due to expected changes in the sun as it ages. The expected increased luminosity of the Sun will likely speed up the rate of surface weathering. This will eventually cause most of the carbon dioxide in the atmosphere to be squelched into the Earth’s crust as carbonate. Though volcanoes will continue to pump carbon dioxide into the atmosphere in the short term, it will not be enough to keep the carbon dioxide level stable in the long term. [full citation needed] Once the carbon dioxide level falls below 50 parts per million, C3 photosynthesis will no longer be possible. This is expected to occur about 600 million years from now. [citation needed]

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