The core of the concern about climate change is what it’s going to do to human society. Nobody gives a shit what the climate looked like a million years ago - complex human society reliant on large scale agriculture didn’t exist a million years ago, and that’s all we care about. We worry about droughts because they affect our crops and cause famines, we worry about heat waves because they kill our people and livestock, we worry about sea level rise because it damages our cities, we worry about hurricanes of increasing intensity because they kill people and damage our cities. We don’t give a shit if we’re in a relatively cool period in earth’s history or if the whole thing will shift in a hundred thousand years because that’s totally fucking irrelevant to what’s going to happen in the next hundred years and how we’re going to adapt our cities, crops, and cultures to it, because that’s what actually matters to us, because we’re actual living people in a complex society and we’d like to stay that way on both counts.