In the last interglacial, which lasted thousands of years, Greenland did not shed all of its ice.

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Consider that we are currently about 10, 000 years into a typical 12, 000 to 18, 000 year-long interglacial period.

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This has now been going on for 15, 000 to 18, 000 years, a life-friendly period known as an interglacial cycle.

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As mentioned, carbon-14 is radioactive, and as the Sun becomes more active (interglacial times) so does the amount of the radioactive carbon-14.

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We are near the end of an interglacial period, so its of no surprise to see the weather patterns changing with harsher winters.

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During warm interglacial periods, when there may have been no sea-ice at all, an abundance of marine organisms would have left behind fossilised shells.

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Because the intensities of the 397 ka BP and present insolation minima are very similar, we conclude that under natural boundary conditions the present insolation minimum holds the potential to terminate the Holocene interglacial.

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In part, this is because the interglacial during which human population has expanded to cover the earth is ending, and in part it is because mankind does not have planetary institutions that are sufficiently robust to enable widespread agreement about this issue.

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