RESOURCE CRISIS: How to destroy a civilization
▻http://cassandralegacy.blogspot.fr/2014/05/how-to-destroy-civilization.html
Mathematical models may be a lot of fun, but when you use them to project the future of our civilization the results may be a bit unpleasant, to say the least. That was the destiny of the first quantitative model which examined the future of the world system; the well known “The Limits to Growth” study, sponsored by the Club of Rome in 1972. This study showed that if the world’s economy was run in a “business as usual” mode, then the only possible result was collapse.
This kind of unpleasant results is a feature of most models which attempt to foresee the long term destiny of our civilization. Not that it should be surprising considering the speed at which we are wasting our natural resources. Nevertheless, whenever these studies are discussed, they generate a lot of criticism and opposition. It is the result, mainly, of emotional reactions: there is nothing to do about that, it is the way the human mind works.
But let’s try to put aside emotions and examine a recent study by by Motessharry, Rivas and Kalnay (MRK) on the destiny of human society that became known as the “NASA funded model” after a note by Nafeez Ahmed. The model has attracted much criticism (as usual) but it is worth looking at it with some attention because it highlights some features of our world which we should try to understand if we still think we can avoid collapsing (or at least mitigate it).
The MRK model has this specific feature: it divides humankind in two categories, “commoners” and “elites”, assuming that the first category produces wealth while the second doesn’t. In some assumptions, it turns out that the elite can completely drain all the resources available and bring society to an irreversible collapse, even though the resources are renewable and can reform the initial stock.
I think this is a very fundamental point that describes events which have happened in the past. As I noted in a previous post, it may describe how the Roman Empire destroyed itself by excessive military expenses (we may be doing exactly the same). Or, it may describe the collapse of the society of Easter Island, with a lot of natural capital squandered in building useless stone statues while putting a high strain on the available resources (the story may be more complex than this, but its main elements remain the same)
So, it looks like elites (better defined as “non productive elites”) may play a fundamental role in the collapse of societies. But how exactly can this be modeled? The MRK model does that using an approach that, as I noted earlier on, is typical of system dynamics, (even though they do not use the term in their paper. Not only that, but it is clearly a model in the style of those “mind sized” models which I had proposed in a paper of mine. The idea of mind sized models is to avoid a bane of most models - of all kinds - that of “creeping overparametrization”. Since, as a modeler, you are always accused that your model is too simple, then you tend to add parameters over parameters. The result is not necessarily more realistic, but surely you add more and more uncertainty to your model. Hence, the need for “mind-sized” models (a term that I attribute to Seymour Paper)........
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