There is no “Climate Science”. There is only science of all sorts that can be applied to the Climate. That human caused CO2 emissions are driving whatever is happening to the various surface temperatures (local, seasonal, daily, ocean, city land, farmland, forests, deserts, etc) is not even proven statistically, much less causally. It’s still all hand and arm waving.
One thing that bothers me about their methods,
They take multiple proxies that are unrelated that have a similar shape and put them together to improve the certainty in their conclusions.
With this approach, you will automatically get a sharper and crisper line when you run your analysis.
The problem is, it doesn’t mean anything, it is a bad statistical practice to take unrelated data and average it together to improve the statistical significance of it. All you are doing is really finding that they are significantly similar, not that the values are correct.
Massive urbanization has done a remarkable job in warming the thermometers; the biggest problem to measuring the free atmosphere is that there is no place representative of the entire column average.