Go to the linkand have a look especially at 4.5 (my bolds):

The finding here of a natural climate cycle that oscillates on a centennial scale and impacts temperature in the NH has further implications for the debate about anthropogenic global warming (AGW). It has been considered widely that atmospheric carbon dioxide (CO2) emitted by human activities is responsible for the contemporary global warming signal.Recent research shows, however, that neither atmospheric CO2nor marginal radiative forcing by CO2is generally correlated discernibly with global temperature over the past 425 million years [3]. Therefore, neither atmospheric CO2nor marginal radiative forcing by CO2caused temperature change in the ancient climate [3]. The same study showed that contemporary marginal radiative forcing by atmospheric CO2has declined by approximately two-thirds since the beginning of the Industrial Age owing to the well-known logarithmic relationship between radiative forcing and atmospheric CO2concentration [3]. Progressively larger concentrations of atmospheric CO2therefore yield progressively smaller global temperature change, minimizing any possible impact of CO2on global temperature.

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