I am not sure what you could do to prepare for a 80000 year ice age, or perhaps he believes this is a minor one. 400 years, 80000 years, neither one is good.

Thing is, before that flip, something catastrophic is going to happen. If you believe the old atlantis legends.

https://www.google.ca/books/edition/Atlantis/0j8yAQAAMAAJ

“ O Solon, Solon, you Hellenes are but children , and there is never an old man who is an Hellene. ' Solon, hearing this, said, “ What do you mean ? “ I mean to say,' he replied, that in mind you are all young ; there is no old opinion handed down among you by ancient tradition, nor any science which is hoary with age. And I will tell you the reason of this : there have been , and there will be again, many destructions of mankind arising out of many causes . There is a story which even you have preserved, that once upon a time Phaëthon, the son of Helios, having yoked the steeds in his father's chariot, because he was not able to drive them in the path of his father, burnt up all that was upon the earth , and was himself destroyed by a thunder-bolt. Now, this has the form of a myth, but really signifies a declination of the bodies moving around the earth and in the heavens, and a great conflagration of things upon the earth recurring at long intervals of time: when this happens, those who live upon the mountains and in dry and lofty places are more liable to destruction than those who dwell by rivers or on the sea-shore ; and from this calamity the Nile, who is our never- failing savior, saves and de livers us. When, on the other hand, the gods purge the earth with a deluge of water, among you herdsmen and shepherds on the mountains are the survivors, whereas those of you who live in cities are carried by the rivers into the sea

Or the old greek legends...

https://www.google.ca/books/edition/The_Classic_Myths_in_English_Literature/BbsXAAAAYAAJ

The Flood. Jupiter, observing the condition of things, burned with anger. He summoned the gods to council . Obeying the call, they travelled the Milky Way to the palace of Heaven. There, Jupiter set forth to the assembly the frightful condition of the earth, and announced his intention of destroying its inhabitants, and providing a new race, unlike the present, which should be worthier of life, and more reverent toward the gods. Fearing lest a conflagration might set Heaven itself on fire, he proceeded to drown the world .

Or native american.. https://www.google.ca/books/edition/The_Journal_of_American_Folklore/W_MQjQObcooC

Notwithstanding, in the course of time, mankind deteriorates. Nexhequiriac, who wants to have his children pure, and grateful to him, resolves upon the plan of a new creation . He orders the four gods, of Water, Air, Death, Fire, to destroy mankind, and leave alive only one male and one female. The destruction proceeds.

Seems like the only point in time where this fact is hidden, is in the present. Curious isnt it.

Anything you build is likely going to be destroyed in the event. All you can really do is accept that the future was never written in stone and enjoy the days that you can. Its a shame that the elites of this world are going to make us poor indentured slaves before that happens. Im sure itll help if one or two of their underground cities make it.

Oh, interesting, thank you.