I find this article very interesting because it mentions the nano-diamonds that were scattered around our planet some 12,877 years ago.
I discuss these nano-diamonds in depth in Magnetic Reversals and Evolutionary Leaps.
The article goes on to say that soot and platinum group metal deposits found in the same layers as the nano-diamonds are evidence of a meteor strike.
What the article does not mention is the Gothenburg magnetic reversal, which I believe is the real culprit here, not a meteor strike. The article also does not mention the mass extinction at the time, which killed off so many ice-age mammals, including the mammoth, mastodon, short-faced bear, sabre-toothed cat, and many, many more.
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“Was there a time in the last few thousand years when CO2 was as high or higher than today?” asks this article by P Gosselin. “Yes, there was, at the end of the last ice age during the Younger Dryas (YD) cold period.”
“What was the temperature during that time? It was much colder than now, as much as 12°C in Greenland.
“Did the temperature go up when the CO2 level went up? No, it went down.
About 13,000 years ago, at the end of the last ice age, after two thousand years of warming, melting ice, and rising sea levels, came an abrupt reversal; a cold period that lasted over a thousand years.
The Younger Dryas is named for an alpine flower, Dryas Octopetala, the pollen of which is found in northern tundra areas during this time.
It is thought that the Younger Dryas was caused by the collapse of the northern ice sheets, changing the North Atlantic Overturning Currents. One theory is that the ice sheet collapse was triggered by a comet or meteor strike.
The evidence is a layer of nano-diamonds found in North America and Europe at about the beginning of the Younger Dryas. In that layer there are soot deposits and platinum group metals indicating an extraterrestrial source that caused large forest fires.
Gosselin goes on to show that the nano-diamond event triggered a massive increase in CO2 that lasted for less than 40 years.
However, that increase in CO2 did not cause warming. In fact, our planet continued to cool after the nano-diamond event.
And because the increase in CO2 lasted less than 40 years, it shows that large amounts of CO2 do not persist in the atmosphere for a thousand years as some in climate science claim.
There is no evidence in this data that CO2 drives temperature. On this plot, CO2 and temperature tend to go in opposite directions more than in the same direction.
The paper does acknowledge that CO2 stimulates plant growth, stating that organic matter in their core samples rose during the higher CO2 period from around 20% to a peak of 35%.
Thanks to Steven Woodcock for this link