If that is a concession that there are no experiments by which we could calculate the RANGE of likely global temperature increase based on the stated premise, that's your first display of honesty, abey.
No, it's only my most recent.
I continue to suspect that English is not your native tongue. One would not conduct an EXPERIMENT to determine the response of the climate to a given change. One would do a calculation using a lot of estimated values and parameters.
But referring folks to the Assessment Reports of the Intergovernmental Panel on Climate Change represents back-sliding by you. The incredible BIASES of the IPCC have become well established. Fuck. Even a dishonest hack like you OUGHT to know that much, Abey.
And this, of course, is simply further evidence that you don't have a fucking clue.