Subject: Re: At this time of Christmas
These tilt and orbital variations, known as Milankovitch cycles, slowly change over millennia, influencing long-term ice ages

When the next ice age comes, assuming we humans haven’t blown ourselves off the planet by then, those who remain will curse us for having used up every drop of petroleum for such lofty purposes as driving to the corner store for a pack of cigarettes - meanwhile they and their families huddle in mud huts (there being no fuel to make steel or glass anymore) to try to survive the cold.

Merry Christmas.