by Dr S. Lüning and Prof. F. Vahrenholt, March 26, 2017,  in NoTricksZone

In addition, we consider temperature dependent natural emission and absorption rates, by which the paleoclimatic CO₂ variations and the actual CO₂ growth rate can well be explained. The anthropogenic contribution to the actual CO₂concentration 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.”