Each warm, interglacial period is associated with increasing temperatures and increasing levels of CO₂. Ice core data show that temperatures rise before CO₂. This means that CO₂ is not the cause of rising temperatures but the consequence. The explanation is quite simple: during warm periods life proliferates and, since life is carbon based, CO₂ levels increase: CO₂ is an indicator of life.

The Vital Needs Theory - page 93

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