re: #839 EndlessBob

Nobody is denying that CO2 is a greenhouse gas. It’s just that it’s the weakest of the Big Three (H2O vapor, SO2 and CO2). CO2 is at 387 ppm, and the human-contributed part of that is about 5%, or about 19 ppm. The geologic record shows that there have times times when the Earth was cooler than it is now and the CO2 levels were much higher. How does one account for that? More handwaving away of the data?

Source for that 5% number, please.

I also noticed that you also had no mechanism for what turned around the Vostok warming cycles, if they were indeed CO2-magnified. One can’t have it both ways: if the CO2 took over from the “unknown cause” that started the warming, why didn’t the global temps run away?

Earth’s climates have many buffers. It didn’t run away in the Cretaceous, either, but we had inland seas in what would become continental US. I’d rather not, thank you.

The scientific answer to that question is “because the CO2 wasn’t causing the warming.”

No. CO2 may not have initiated ancient warming cycles. But that is not applicable to the case today, when it is providing a clear forcing factor.

That question is still unanswered, but all geologic indicators are that the answer is “no.”

Simply false. The geologic and climate evidence does not support you.