Using Gizmo, It would take about 50 years to return to atmospheric CO2 levels from the year 1800.
The trends according of the data shown of atmospheric concentrations of CO2 from 1800 is that it has increased to about 50%.
Note that Atmospheric CO2 is constantly rising ever and it has been the cause of the warming of the global climate as resent studies has shown that it has about 50% increase from 1750-1800 average.
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