Where are the ice ages in the chart?
Where are the ice ages in the chart?
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See the drop near the end of the graph with that artificial spike? The ice-ages began about 1.2 million years ago (late Pleistocene Epoch) with a mysterious shift in the climate to long cold periods where sea-levels dropped and short duration warm interglacials where sea-levels rose again. The cold oceans absorbed CO2 but during warm interglacials, CO2 was released back into the atmosphere. The temperature rise during interglacials always preceded the rise in CO2 by ~800 years.
There have been several ice-ages over the last one million years, each lasting over ~100,000 years. In between were short period interglacials, each lasting about 10,000 years; all caused via natural processes.
The last interglacial period (Eemian) ended 115,000 years ago. The current interglacial period (Holocene) began in earnest about 11,000 years ago but glaciers began melting 20,000 years ago. Over this melting period, global sea levels rose 120 meters. Noah’s flood probably occurred during the Holocene optimum, ~7000 years ago.