40 years after the publication of “Limits to Growth”, we discover that we have been just following the trajectory of the “base case scenario” of the book; business as usual, and with a disturbing accuracy level. In fact, in the intentions of the authors, the BAU scenario was not a forecast, but just one scenario among others, useful to analyse how the system works and changes. But the real world itself has turned this scenario among others into an authentic prophecy (image source)
To get a better understanding of this issue, I think it is best to start by considering World3 itself. In a post of some time ago, Ugo Bardi showed that, behind its complexity, World3 has a very basic thermodynamic architecture. It is a system that builds up and stocks information, with a positive retroaction to the inside flow. The larger the system is, the more it is able to extract low entropy from the wells and throw out entropy to the sinks.
In other words, the BAU scenario more or less describes the activity of bacteria inside a Petri box. First of all, it starts to exploit the very best resources (for instance: sugar) and so it grows. As it grows, it needs more resources and so it starts to digest everything available and, at the same time, it evolves as fast as possible in order to implement its efficiency in the exploitation of increasingly rare and poor resources. This until, at the end, it digests itself and dies.
