Geothermal energy in the United States Geothermal Data System (NGDS). Through the NGDS, many older paper archives and drill logs that are stored at state geological surveys are now being digitized and made available for free to the public. The underground hot water and steam used to generate geothermal power may contain chemicals that could pollute the air and water if released at the surface. Hydrogen sulfide, which is toxic in high concentrations, is sometimes found in geothermal systems. Newer methods of generating geothermal power separate the hot steam collected underground from the steam used to power turbines, and substantially reduce the risk of releasing air-polluting
Notes from Underground serfs, Russia was still very much a post-medieval, traditional peasant society. However, when "Notes From Underground" was written, there was an intellectual ferment on discussions regarding religious philosophy and various 'enlightened' utopian ideas. Dostoevsky, however, along with his notable contemporary, Soren Kierkegaard, rejected such ideas for proto-existentialist themes. Most importantly, the legacy that the work leaves is a challenge to and a method of understanding the larger implications of a utopian society. Utopianism largely pertains to a society's collective dream, but what troubles the Underground Man is this very idea of collectivism. The point the Underground Man makes is that