Circulation of the ocean plays an equally important role in regulating the earth’s climate as the atmosphere. Major cooling of Earth and continental ice build-up in the Northern Hemisphere 2.7M years ago coincided with a shift in the circulation of the ocean – which pulls in heat and CO2 in the Atlantic and moves them through the deep ocean from north to south until it’s released in the Pacific. The ocean conveyor system changed at the same time as a major expansion in the volume of the glaciers in the northern hemisphere as well as a substantial fall in sea levels. It was the Antarctic ice that cut off heat exchange at the ocean’s surface and forced it into deep water. This caused global climate change at that time, not CO2 in the atmosphere.

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