Half life calculation of cumulative CO2 emissions

Cumulative CO2 emissions in the 50 years since 1965

The residence time of CO2 in the atmosphere is about 5 – 10 years.  The CO2 burden for which man-kind can be  responsible extra CO2 is absorbed by improving the growth of all plant life and is quickly resorbed by the oceans.

This is a simplistic view, the whole question of the various Carbon cycles is well covered by Clive Best here:


The following graphs shown 5 and 10 year half-life calculations.

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These graphs show that on both an 5 year and 10 year half-life basis Chinese CO2 emissions have already surpassed the USA.  And that on a 5 year half-life basis the 160 nations of the underdeveloped world are approaching the cumulative emissions of the EU(28).

When the cumulative 5 years half-life CO2 emissions / head are plotted the significant decline in the USA arising from the growing use of fracked gas for electricity generation becomes clear.

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