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Scrutinizing the carbon cycle and CO2 residence time in the atmosphere

February 24, 2017
By Hermann Harde

Argues humans are only responsible for 4.3 percent of the carbon dioxide in the atmosphere and only 15 percent of the growth since the industrial revolution.

From the Abstract:

Climate scientists presume that the carbon cycle has come out of balance due to the increasing anthropogenic emissions from fossil fuel combustion and land use change. This is made responsible for the rapidly increasing atmospheric CO2 concentrations over recent years, and it is estimated that the removal of the additional emissions from the atmosphere will take a few hundred thousand years. Since this goes along with an increasing greenhouse effect and a further globalwarming, a better understanding of the carbon cycle is of great importance for all future climate change predictions.We have critically scrutinized this cycle and present an alternative concept, for which the uptake of CO2 by natural sinks scales proportional with the CO2 concentration. In addition,we consider temperature dependent natural emission and absorption rates, by which the paleo-climatic CO2 variations and the actual CO2 growth rate canwell be explained. The anthropogenic contribution to the actual CO2 concentration is found to be 4.3%, its fraction to the CO2 increase over the Industrial Era is 15% and the average residence time 4 years.