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The Deep Ocean May Be Colder Today Than Any Time In The Last 4.5 Million Years

The Deep Ocean May Be Colder Today Than Any Time In The Last 4.5 Million Years

By on 20. November 2025

A new study finds Earth’s bottom water temperatures (BWTs) have cooled by 2-3°C over the last 4.5 million years through to the pre-industrial era (1750). Since 1750, however, global BWTs have not risen in a detectable way, nor have they exceeded the warmth achieved during the Medieval Warm Period (Gebbie and Huybers, 2019). The Pacific […]

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