Thanks to Tim Black for recommending this article.
The Olduvai theory has been called unthinkable, preposterous, absurd, dangerous, self-fulfilling, and self-defeating. I offer it, however, as an inductive theory based on world energy and population data and on what I’ve seen during the past 30 years in some 50 nations on all continents except Antarctica. It is also based on my experience in electrical engineering and energy management systems, my hobbies of anthropology and archaeology, and a lifetime of reading in various fields.
The theory is defined by the ratio of world energy production (use) and world population. The details are worked out. The theory is easy. It states that the life expectancy of Industrial Civilization is less than or equal to 100 years: 1930-2030.
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Current World Population
Net Growth During Your Visit