claim: that atmospheric CO2 increase that we observe is a product of temperature  increase, and not the other way around, meaning it is a product of  natural variation...
evidence: European Science Foundation in a 2007 position paper states: There is now convincing evidence that since the industrial revolution, human activities, resulting in increasing concentrations of greenhouse gases have become a major agent of climate change ... On-going and increased efforts to mitigate climate change through reduction in greenhouse gases are therefore crucial.