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.
Huronian - The Huronian ice age was one of the longest ice ages in the Earth's history. It lasted from about 2400 to 2100 million years ago. Scientists think it may have been caused by a lack of volcanic activity lowering the carbon dioxide in the atmosphere.