Further, co2 ppm counts are actually nowhere near as high as they've been... In the Carboniferous period, concentrations were as high as 8000 ppm. . http://www.geocraft.com/WVFossils/Carboniferous_climate.html .
Again, if co2 feedback forcing were the primary driver, we'd already be wearing asbestos underwear.
If I remember correctly, claims of CO2 levels up to 8,000 ppm were originally made about the Ordovician period. Years later the levels were revised downward to 1,000 – 2,000 ppm.
(Your link is not working).
But whatever the level, with CO2 levels that high, the temperature of the earth should have been very high. Instead there were times when the earth came close to turning into a block of ice.
The reason is straight forward; the earth was a very different place 400+ million year ago.
A while ago, late one night, I typed up the following, a bit in jest as reply to the same essential comment as yours. In re-reading my post, I think that I was close enough on the issues to not need to issue much a correction. So here is most of the post again:
Off the top of my head (plus review of vid below), and an almost complete bottle of wine, … here’s what I can say.
Yes 400 million years ago C02 levels were high (1,000 – 2,000 ppm). As I said, even at these levels the earth almost turned into a block of ICE. If you think about it, though, the earth was a LOT DIFFERENT back then.
But let’s just move on.
I’ll tell you what, take care of these issues for me and I’ll be OK with most of what you have to say about not worrying about high C02 levels.
1) Please cool down the effect of the sun for us. I guess you can hose it down or perhaps push out the earth’s orbit a bit. (I might have an HP 41cv to help you out to figure out how far the orbit will have to go. BTW, you will have to supply the batteries)
2) Push the continents back together. You know, reverse all of that tectonic stuff.
3) Once #2 is done, hammer all of the mountains down flat. I know that this sounds tough but my thoughts are that if you pulled off #2 this shouldn’t be that hard.
4) You got to kill off a bunch of plants. Unfortunately I don’t have a list right now. But I might be able to work out a punch down list by the time you get to this task.
5) Kill off a lot of the animals. (See #4 for issues with list)
6) TBD
I think that I already posted below before. Real short. Informative;
UQx DENIAL101x 4.2.4.1 Ancient CO2 levels
https://www.youtube.com/watch?v=aqkGoCglp_UUpdate: 1,000 - 2,000 ppm levels were the revised lower end of CO2 levels in some models.