This book is intended for a wide range of readers who are interested in this topic and who have natural scientific and technical knowledge. This study there are no assumptions that go beyond classical science and the known knowledge about the nature of things. The simplicity of the presentation of the material was chosen according to the principle of "Occam's razor" to show with a simple and understandable example the possibility that has been hidden from us until now, which is in our environment or - as a physicist would say - in a force field in which we are. Based on the laws of generally-accepted classical physics - including the fact that the earth and its gravitational field have a central and homogeneous character on its surface - here a mathematically exactly-calculated theory is constructed step by step, which is substantiated by physics without any assumptions.It is about the possibility of using the gravitational field of the earth for performing useful mechanical work. Upon first consideration, it seem almost unthinkable. However, a closer look changes the preconceived notion without harming physics. Based on this theory, the state of the art of industry is now able to design and produce environmentally-neutral power plants of any capacity, which can be solve the current energy problems of the world population. It can preserve non-renewable resources of our planet and protect our ecology. It's old good physics." It is harder to crack prejudice than an atom. " Albert Einstein
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