Its interesting. I agree that scientists use historical climate changes to try to force modern politicians to spend money on their causes. However, there is real value in looking at non-man-made causes for the fall or empires. Global climate change probably did play a roll in Western civilization’s rises and falls. So did disease. The collapse of the Eastern Empire and the surge of the Persians and Arabs into Egypt and the Holy Land can be linked in part to a devistating plague that wiped out from a quarter to perhaps half of the Byzantine population. Its fascinating research that, if done right, can really help us understand history.
Yes, all true but as conjecture, as historical possibility, probability but not postulation.