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.
Black ice can also be caused by the exhaust of vehicles standing still with engines idling. It can be hidden by fallen leaves, blowing dust, or even trash. Black ice can also form very quickly on bridge decks, or sections of roads, runways or taxiways that may pass over a culvert.