I found a couple of papers about correlations between Earth-orbit perturbations and ice ages; submitted separately: https://news.ycombinator.com/item?id=165338

I found a couple of papers about correlations between Earth-orbit perturbations and ice ages; submitted separately: https://news.ycombinator.com/item?id=16533837 https://news.ycombinator.com/item?id=16533837