Geology provides a timestamped record of palaeoclimate, and it is only by looking at the whole of Earth history that you might understand what drives climate, and what the limits of variation are over what time scale. To try to do this by monitoring some thermometers for a couple of hundred years is just silly.
Discussion
Strawman argument. Paleo climate is certainly included in climate science and pretending that it isn't is dishonest or ignorant. It's the reason why we can differentiate between natural drivers of change and human drivers in the first place