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Comment by PowerElectronix | Hacker News Reader

Does this mean that the ice wasn't there during the stone age?

Yes: most mainland Norway ice was gone during the holocene climatic optimum (9–6 thousand years ago), and glaciers recovered since then (until approx the 20th century, when deglaciation started accelerating again).

The climate is varying in long cycles, and the deglaciation 20 thousand years ago (last glacial maximum) was driven by a spike in summer temperatures, and this peak has already long passed. Ice ages and interglacial periods have a certain momentum to them, so it takes more than just that to go back to full ice age..

Yes, the early Neolithic was warmer than modern era.

wrong: IPCC AR6 puts the warmest Holocene stretch (~6.5 ka) at about 0.2-1°C above 1850-1900. 2011-2020 already beat that

No, it's not wrong or we wouldn't be finding 5K year old instruments underneath melted glaciers as this article's evidence shows. And ice core samples from Greenland and Antarctica support this.

The glacial cycle was longer duration, lower fluctuation.

Glaciers don't melt instantly the moment the temperature flips from "form glaciers" to "melt glaciers". They operate on the integral of temperature -- heat. The temperature determines how fast they melt or form.

These melted really, really fast.

I don't think you understand. There were no glaciers there 6K years ago or humans would not have been able to inhabit the area at the time to leave these instruments. At some point in the last 6K years the glaciers in this area grew to expand over top of of the settlement that was there (that is to say, the temperatures grew cold enough long enough to sustain growth and maintenance of glaciers in this area over the past 6,000 years), and buried these instruments. Only now, are the glaciers melting to the point that we can find such instruments again, as we approach similar temperatures to early holocene (which began 11.5K years ago).

Without taking a position I will point out that your stated reasoning doesn't hold due to how much momentum these systems have and how slowly they respond. It seems entirely plausible that this outcome would still have happened if temperatures had plateaued several years ago.

Do you also wait until the inside of the meat is the temperature you want before taking it off the grill, then are later surprised when it is overcooked?

He's talking about information, not actions to take

Did they have coral reefs?

Of course the earth had corals in the early holocene.

Whatever you put in the glacier the glacier gives back to you. Anything you leave there ends up at the bottom of it in the moraine.

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