Rapid increase of CO2 and associated increase in temperatures have also been linked with mass extinctions.

It will be a great boon to the suede shoe and blue dye industries.

Uh huh

The end of the last glacial maximum and Younger Dryas changes were quite rapid, and in some locations but not globally reached the same rate for short periods. We see in the palenteological and archaelogical records that when local conditions did change rapidly then either people moved or the local civilisation collapsed, or a combination of the two.

Where some might include most species, as has been the case in the past. Hopefully, we can avoid that.

For many of the types of organisms that existed during periods of rapid change in CO2, it did end.

Hominids have not existed outside an ice age.

Swamps that have been swamps for 1000s of years can be fertile after being drained. Ones that have been permafrost, not so much. And you are talking about draining vast areas where there is no infrastructure as opposed to penny packets conveniently next to infrastructure.

Circa 1000 years for decent fertility. That's time to build infrastructure, at least. Maybe.

If only I had mod points. That poor cow (and spherical turkeys) used to come up quite often.

Especially about the future.

The price per square meter now is a fraction of what it was.

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Generally these theories make predictions about how the universe should be now. That is, they are testable. However, dark matter is based on the requirement to explain the universe as it is now based on other laws of physics remaining as we currently understand them. Perhaps that might be seen as a bit of 'god of the gaps', but it still makes a prediction that there is a form of matter that is dark and should, under some circumstances, but directly observable, we're just not in a technological position currently to do so, much like we weren't in a position to prove the Moon wasn't made of green cheese but could in the late 1960s (the USSR got a probe there first, but it probably wasn't in a position to determine the cheese/not cheese dichotomy but Apollo brought stuff back which is clearly not cheese).

Just because we don't know how right now how to test it does not mean it won't be testable. Many things have been postulated without the ability at that time to be tested but were later tested and some were falsified and some were not.