Abstract
The middle Cretaceous (125-88 Ma) greenhouse world was characterized by high atmospheric
CO₂ levels, the general absence of polar ice caps, and much higher global
temperatures than at present. Both δ¹⁸O-based and model-based temperature reconstructions
indicate extremely high sea-surface temperatures (SSTs) at high latitudes. However,
there are a number of uncertainties with SST reconstructions
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