Part of the issue with predicting long-term climate change is the uncertainty as to how CO2 affects temperature. Estimates of CO2’s contribution to the greenhouse effect vary greatly between 2% (0.7 C) to as much as 26% (8.6C) of the total 33 C greenhouse effect. This means that there is some uncertainty as to CO2’s actual contribution. In addition, there is also uncertainty about the sensitivity of the climate to CO2. The best estimates I can find is that doubling CO2 in the atmosphere should result in a warming of 0.4 C to 1.2C before factoring in any feedbacks. http://oceanweatherservices.com/blog/2019/01/29/what-is-the-greenhouse-effect/
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