After reading your link, decided to Google “images of earth temperature charts for past million years.” Unfortunately, only a few of these charts cover one million years. A lot only go to 400K or 800K or many millions of years. The second link shows one specific chart and it’s site which does cover 800K. [I wish I knew how to transfer over these graphics to FR comments.] Interestingly, there is a strong drop right were one would expect with your linked article. Also interesting is the unusually low drop in atmospheric CO2 (orange line). My question: What is it that causes the periodic drops approximately every 100K years? It looks like we might be due for one soon (10K year+-).