I think we can expect a new Great Flood within a generation. Unlike the traditional flood myths of the world which are reckoned in millennia, this one will happen jack-rabbit fast, but the effects must be thought of in terms of million-year cycles . It will be an artificially-induced Cretaceous cycle, polar ice all gone as before. This time it's mixed in with nasty residues of radioative fallout from nuclear power station meltdowns. Fukushima x 400, scattered across the planet. Fairly warm seas and saturation of CO2 and methane in atmosphere. I don't think this is outside the current scientific predictions.

Safer areas to escape would be the highest mountain ranges of the world. Not that you would have any easy chance of survival trying to tend a garden on top of barren, rocky soil, living next to 10,000 ft. drop-offs and difficult access to potable water for irrigation. Yet you would have to expect some adaptation.

Flood myths are usually, with some exceptions, attributed to divine punishment for the sinful nature of mankind. Genesis 6: “...the LORD saw that the wickedness of man was great in the earth, and that every intent of the thoughts of his heart was only evil continually.”

Apache traditions say that the Great Spirit sent a flood to drown the whole earth because people did not worship him.

One group of Australian aborigines say it was caused by a great human-like snake as punishment for sexual immorality.

I think this new ' flood myth' may be remembered as caused by our following failures, take your pick, mix or match:

1. disrespect of the natural resources of the Earth.
2. our refusal to maintain world population levels.
3. belligerency of nations and constant warring.
4. the corruption in political systems which defraud our ability to elect wise leaders (mostly confined to USA with its systemic voting fraud).

I'm missing some more reasons, but those are just the first few that come to mind.