xkcd comic strip convinently goes only to 20k bc https://upload.wikimedia.org/wikipedia/commons/f/f8/Ice_Age_Temperature.png https://upload.wikimedia.org/wikip

xkcd comic strip convinently goes only to 20k bc https://upload.wikimedia.org/wikipedia/commons/f/f8/Ice_Age_Temperature.png https://upload.wikimedia.org/wikipedia/commons/f/f8/Ice_Age_...