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Many publications appeared in 1976 and 1977 on the subject of energy consumption during the next few decades and the results obtained are summed up in the present article. It is generally agreed that the total worldwide energy consumption should amount to about 14000 Mtoe in the year 2000, that foreseen for industrialised countries lying between 9000 and 10500 Mtoe. On a sectorial basis it seems that oil production is likely to reach a ceiling before 2000, increased demands for coal will raise infrastructure and development problems while nuclear energy appears necessary but its contribution could be reduced, the installed power reaching only a hundred thousand GWe in 2000. Once the findings have been stated the gaps and divergences in these studies are discussed by the author. The prospects are extended beyond the year 2000 in order to focus on the problems connected with energy supplies and the importance of the time factor, likely to show which resource is scarcest.