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An anthropogenic or artificial cloud, is a cloud induced by human activity. Although generally clouds covering the sky have only a natural origin, from the beginning of the Industrial Revolution, the use fossil fuels and water vapor and other gases emitted by nuclear, thermal and geothermal power plants yield significant alterations of the local weather conditions. These new atmospheric conditions can thus enhance cloud formation.〔Describing Wilson's cloud chamber. 〕 Anthropogenitus is the term used to designate the origine of clouds produced by human activities. Various methods have been proposed for creating and utilizing this weather phenomenon. Experiments have also been carried out for various studies. For example, Russian scientists have been studying artificial clouds for more than 50 years.〔(Russian scientists create artificial cloud ) August 28, 2010 NECN/CNN〕 But by far the greatest number of anthropogenic clouds are airplane contrails (condensation trails) and rocket trails. == Anthopogenesis == (詳細はsaturation of its water vapor, #the air must be cooled to the dew point temperature with respect water (or ice) to condensate (or sublimate) part of the water vapor, #the air must contain condensation nuclei, small solid particles, where condensation/sublimation starts. The current use of fossil fuels enhances any of these three conditions. First, fossil fuel combustion generates water vapor. Additionally, this combustion also generates the formation of small solid particles that can act as condensation nuclei. Finally, all the combustion processes emit energy that enhance vertical upward movements. Despite all the processes involving the combustion of fossil fuels, only some human activities, such as, thermal power plants, commercial aircraft or chemical industries modify enough the atmospheric conditions to produce clouds that can use the qualifier anthrogenitus due to its anthropic origin. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Anthropogenic cloud」の詳細全文を読む スポンサード リンク
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