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.
Ice ages are caused by a variety of reasons: Milankovitch cycles: The earth is a spinning top rotating around the sun. Theoretical physics has shown a few 100 years ago that any top can experience rotation, precession and nutation. The earth does, too. However the periods are naturally oscillating.