We consider atmospheric environment itself as the thermal energy resource. In order to utilize this terestrial environment energy sources into practical form we suggest, as the heat sink, the cold air in the altitude above 10 km from the ground. The construction of tower to this height is discussed. For the generation of 1 GW power the economical column size of the tower is on the average around 350 m. By taking into considerations of dissipation energy due to air circulation, surface radiation, water drag force and etc., the overall conversion efficiency of 16% is achieved. This mechanical conversionsystem of thermal energy at room temperature is expected intrinsically to be pollution free and the resources are virtually unlimited.

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