Just compare the IPCC's 1991 predictions of the range of expected global temperatures to the actual observations. We are at the extreme bottom of the range. Another year with business as usual, and we will completely fall off the bottom. If that happens, it is reasonable to suggest they overestimated the climate's CO2 sensitivity. Anything else is denial of empirical facts.
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Just compare the IPCC's 1991 predictions of the range of expected global temperatures to the actual observations. We are at the extreme bottom of the range. Another year with business as usual, and we will completely fall off the bottom. If that happens, it is reasonable to suggest they overestimated the climate's CO2 sensitivity. Anything else is denial of empirical facts.