Natural draught cooling towers are inevitable for the economic generation of electricity under environmental aspects: In any thermal power plant heated stearn drives a turbogenerator, which produces the electric energy. In order to create an effective heat sink behind the turbine, the stearn is condensed and recyc led into the boiler. This requires a large amount of cooling water which is heated by running through the condensor. Even in the most efficient fossil fuel thermal (nuclear) power plants, only about 40 (30)% of the generated heat is turned in to electric energy. The rest of heat of...