(08-24-2023, 08:29 PM)Ninurta Wrote: I only know of 3 cooling periods in Earth's history, and it has been warmer, usually MUCH warmer, at all other times. Those 3 cooling events are 1)the "snowball Earth" incident, where the entire planet froze over all the way to the equator, and stayed frozen for a couple million years, 2) the end of the Carboniferous period into the Permian, when the Earth cooled, ice caps formed, and mass extinctions took place due to a dearth of warmth - the Carboniferous rain forest collapsed during that time, and the Permian had a number of extinctions as well as getting much dryer due to the cooling, and 3) the Pleistocene/ Holocene cooling event, what we call "the ice ages" now, which we are still in, which is what explains currently below-average temperatures.
Milankovitch cycles
Only way to survive them (cold ones) is by being underground.
Once you've figured that out, why come up at all? Shplains where the UFO people are coming from too.