It is a generally realized fact that the structure of energy technology is changing, mainly characterized by the fact that crude oil, the principal raw material for generating energy is being substituted by other long-term energy sources. In Fig.1 the historic development of energy consumption in fractions of primary sources of energy is depicted. One can see that, starting with the consumption of renewable energy sources in the late middle ages, first coal, then crude oil and gas were and still are the most important energy resources of mankind, and that, starting from the year 2000, a new energy technology will obviously be needed to be able to meet future energy requirements. These connections are, however, not only characterized by the fact that new forms of energy have to be found but also that the required amounts of energy are by far more than those consumed till now, meaning that a completely new problem arises here. How much more energy will exactly be required can be easily and clearly assessed, there being no need of complicated and intricate system analytic statements to be able to predict these quantitative changes. It is generally accepted that the worldwide population will considerably increase (up to 8–12 billion) in the future and that the living standards of the future population must at least be raised somewhat in comparison with the present average living standard in order to guarantee a stable worldwide social order for the future.
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