I don’t know how the Global Warming Limits (GWLs) of 1.5, 2 or 3°C are established in the modeling studies that are published and referenced in recent IPCC reports. Are the global temperature thresholds of 1.5, 2, or 3 used as input to drive model simulations?. I mean the models are instructed to simulate GWLs of 1.5, 2 or 3 at the end of the century 2100?. What if the model under specified emissions would go for GWLs of 5°C or more?. Does the limit specified for GWLs makes sense scientifically?
The "Limits" are political numbers. Some scenarios in the models also predict higher warming. The models are used to predict the amount of greenhouse gasses necessary to get a certain amount of warming (or not). If you are interested, just download the reports; they are free and a good read:
https://www.ipcc.ch/
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