Excerpt:
The climate is not highly sensitive to CO2 warming because water vapour is a damper against the warming effect of CO2.
That is why history is full of Ice Ages - where other effects, such as increased reflection from the ice cover, do provide positive feedback - while we do not hear about Heat Ages. The Medieval Warm Period, for example, is known for being benignly warm - not dangerously hot.
We live on a benign planet - except when it occasionally gets damned cold.
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