Bohemians live in alternative spaces, these are places that are not normally considered suitable for living in. They don't make wealth their priority. Money is only a means of survival, so they can live for their arts/craft/music/literature...etc.
What causes ice-ages? Fluctuations in the amount of insolation (incoming solar radiation) are the most likely cause of large-scale changes in Earth's climate during the Quaternary. In other words, variations in the intensity and timing of heat from the sun are the most likely cause of the glacial/interglacial cycles.
The timing of the Ice Age would have been controlled by the duration of the volcanism and warmer oceans. As the crust settled and the oceans cooled, the Ice Age would reach a maximum about 500 years after the Flood (based on standard heat budget equations), and then the ice sheets would melt over a 200 year period.