Another theory[1] argues that the reduction of CO₂ has given way to long-term cooling and glaciations. But ice-core data show that the reduction of CO₂ starts after temperatures decrease. CO₂ variations are not the cause, but the consequence of temperature fluctuations.

The Vital Needs Theory - page 96

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[1] Pagani, M. et. all., (2011), The Role of Carbon Dioxide During the Onset of Antarctic Glaciation, Science. 334 (6060): 1261–4.