[montag813]

How did a freshwater turtle get across such a vast sea? Scientists suggest that volcanoes belching CO2 into the atmosphere created supergreenhouse conditions 90 million years ago. As a result, the North Pole was ice-free and at least 34°C warmer than it is today, with a climate resembling northern Florida's. The heat would have contributed to more rainfall in the north, resulting in massive river runoff that capped the Arctic Ocean with a layer of fresh water.

Utterly absurd presumptions, not based on any ice core evidence, but rather based on a fallacious belief in CO2-generated warming.

[neverdem]

Utterly absurd presumptions, not based on any ice core evidence, but rather based on a fallacious belief in CO2-generated warming.

May explain the slow decline in atmospheric carbon dioxide from levels of several thousand parts per million (ppm) about 100 million years ago, to 280 ppm in the pre-industrial time.

I'm pretty sure that's from ice core evidence, but maybe it's another type. That looks like a geology text from Colorado University from its URL.

[neverdem]

CO2, Temperatures, and Ice Ages

I'm more inclined to think higher temperatures forces degassing of of the oceans, but volcanoes also release CO2.