[Gondring]

However, the CO₂ radiative forcing exceeds this variability, no?

[Robert A Cook PE]

No, it (CO2 forcing) doesn’t.

Changes in CO2 have not - even at the very high levels of CO2 in the past - changed temperatures.

Today - as CO2 levels have steadily increased, temps have gone up (twice) , gone down (twice), been steady. No one, at any time in any research, has shown that CO2 changes temperatures at any level (high altitude, mid-troposphere, lower atmospheric, or on the ground.)