I think there's a problem explaining where all the extra water came from.
Ramtha says the planet was in its own "womb" of water. That we lived in a mist cloud. Costant temperature and we had no seas. Only marshlands.
This vapour cloud is also supposed to protect us from the comming solar flares that will cause global warming. But in the past some alien race caused it to rain down. Thus acclimatisng the planet. Only then did the poles freeze over.