[wheelerof4te]

"I think it is safe to say we are already well equipped with it, and whatever our plans for its reduction are, we won't eliminate it."

The CO2 current levels in the atmosphere are 0.04%. Levels in the past were well above 1%.

"As a point of reference, pre-industrial CO2 levels were around 280 parts per million (ppm) and today, we stand near 420 ppm.

The most distant period in time for which we have estimated CO2 levels is around the Ordovician period, 500 million years ago. At the time, atmospheric CO2 concentration was at a whopping 3000 to 9000 ppm! The average temperature wasn’t much more than 10 degrees C above today’s, and those of you who have heard of the runaway hothouse Earth scenario may wonder why it didn’t happen then. Major factors were that the Sun was cooler, and the planet’s orbital cycles were different."

https://earth.org/data_visualization/a-brief-history-of-co2/

They somehow knew that the Sun was cooler then, so that was not a problem. Yeah, right. But now, it would be.

[AstralStorm]

Not to mention mammals didn't exist. And even then it caused mass extinctions of shelled waterborne organisms.

So the question is "equipped for what".

[thinkcontext]

> At the time, atmospheric CO2 concentration was at a whopping 3000 to 9000 ppm! The average temperature wasn’t much more than 10 degrees C above today’s

You talk like +10C is nbd. Are you aware of how much landmass was covered by water during that time?

I'm no expert but that would cause human civilization to take a dramatically different form if not outright extinction.

[wheelerof4te]

No, I'm saying that 420 parts per million is still much lower than 3000-9000 parts per million.

Also, even a number they chose is plain trolling. Of all numbers, 420 ppm is what they "calculated".