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1. Ian C McClintock (2009) – Proof that CO2 is not the Cause of the Current Global Warming – The Lavoisier Group – June 2009 – http://www.lavoisier.com.au/articles/greenhouse-science/climate-change/mcclintock-proofnotco2-2009.pdf
   “There is understandably, considerable uncertainty amongst the majority of the general public about the veracity of the claims made by the Intergovernmental Panel on Climate Change (IPCC) that anthropogenic (man induced) emissions of carbon dioxide (CO2) and other greenhouse gasses, are the cause of the present warming period being experienced by planet Earth. There is no empirical evidence available to demonstrate or prove this relationship, despite the expenditure of some $50 billion directed to this end. The IPCC theory is in fact only supported by computer models that due to the complexities and lack of detailed knowledge of many of the processes involved, are little more than best guesses, designed to accommodate the anticipated outcomes.”
2. Dana L. Royer (2006) – CO2-forced climate thresholds during the Phanerozoic – Geochimica et Cosmochimica Acta 70:5665–5675 – Department of Earth and Environmental Sciences, Wesleyan University – http://droyer.web.wesleyan.edu/PhanCO2(GCA).pdf – ‘Peer-reviewed’
   «This study is not that atmospheric CO2 is always the dominant forcing (see Section 3.7 for an early Paleogene example). Instead, given the variety of factors that can influence global temperatures, it is striking that such a consistent pattern between CO2 and temperature emerges for many intervals of the Phanerozoic.”
3. Aradhna K. Tripati, Christopher D. Roberts and Robert A. Eagle (2009) – Coupling of CO2 and Ice Sheet Stability over Major Climate Transitions of the Last 20 Million Years – Science doi: 10.1126/science.1178296 – Published online 08/10/2009 – Departments of Earth and Space Sciences and Atmospheric and Oceanic Sciences, and Institute of Geophysics and Planetary Physics, University of California, Department of Earth Sciences, University of Cambridge; Division of Geological and Planetary Sciences, California Institute of Technology – http://www.sciencemag.org/cgi/content/abstract/1178296 – ‘Peer-reviewed’
   “We use boron/calcium ratios in foraminifera to estimate pCO2 during major climate transitions of the last 20 million years. During the Middle Miocene, when temperatures were ~3 to 6°C warmer and sea level 25 to 40 meters higher than present, pCO2 was similar to modern levels. Decreases in pCO2 were synchronous with major episodes of glacial expansion during the Middle Miocene (~14 to 10 million years ago; Ma) and Late Pliocene (~3.3 to -2.4 Ma).”
4. Seth A. Young et al (2009) – A large drop in seawater ⁸⁷Sr/⁸⁶Sr during the Middle Ordovician (Darriwilian): Links to volcanism and climate? – Geology 37:951-954 doi: 10.1130/G30152A.1 – Department of Geological Sciences, Indiana University – October 2009 – http://geology.gsapubs.org/content/37/10/951.abstract – ‘Peer-reviewed’
   “A large drop in seawater ⁸⁷Sr/⁸⁶Sr during the Middle Ordovician was among the most rapid in the entire Phanerozoic. New ⁸⁷Sr/⁸⁶Sr measurements from Nevada indicate that the rapid shift began in the Pygodus serra conodont zone of the upper Darriwilian Stage. We use a numerical model to explore the hypothesis that volcanic weathering provided the flux of nonradiogenic Sr to the oceans. A close balance between volcanic outgassing and CO₂ consumption from weathering produced steady pCO₂ levels and climate through the middle Katian, consistent with recent Ordovician paleotemperature estimates. In the late Katian, outgassing was reduced while volcanic weathering continued, and resulted in a cooling episode leading into the well-known end-Ordovician glaciation.”

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