HANDY Model for Civilisational Collapse Scenarios

Discussion

Nafeez Ahmed:

"Anthropologist and complex society expert, Prof Adam T. Smith of Cornell University, said that the HANDY model's central thesis - that a collapse of industrial civilisation due to unsustainable resource exploitation and increasing economic inequality - is perfectly plausible:

"The archaeological record is quite unambiguous: every prior society in every part of the world has ultimately been eclipsed. Human communities are kinds of machines – machines for social life – and just like any machine they fall apart and are discarded. However, civilisational collapse is actually quite rare.

Civilisational collapse typically involves the disappearance of entire ways of life, systems of thought, cultural values and worldviews. These generally do not disappear due to convulsive periods of collapse but rather fade over time as alternative systems of belief take their place.

However, although civilisational collapse is rare, political collapse is constant. Kingdoms, principalities, republics and states come and go and typically their downfall is violent and convulsive. The warnings in the recent study should carry significant warnings to current global political leaders: address the threats posed by climate change and economic inequality or face the rapid undoing of the current political order. The archaeological record suggests that while civilization will likely endure, politics as we know it, odds are, will not." (https://www.theguardian.com/environment/earth-insight/2014/mar/21/climate-change-scienceofclimatechange)

Why the HANDY model is so useful

Nafeez Ahmed:

"Dr Rodrigo Castro of the Department of Environmental Systems Science at ETH Zurich, Switzerland, delivered earlier this month, explains in detail why the HANDY model is so useful:

"It is our predicament that we live in a finite world, and yet we behave as if it were infinite. Steady exponential material growth with no limits on resource consumption and population is the dominant conceptual model used by today's decision makers. This is an approximation of reality that is no longer accurate and started to break down. The World3 model, originally developed in the 1970s [aka the 'Limits to Growth' project which despite Kloor's dismissals has turned out quite accurate according to American Scientist], includes many rather detailed aspects of human society and its interaction with a resource limited planet. However, World3 is a rather complex model. Therefore it is valuable for pedagogical reasons to show how similar behavior can be also realized with models that are much simpler. This paper presents a series of world models, starting with very simple exponential growth and predator-prey systems, then investigates a minimal human-nature model, Handy, and ends with a brief account of the World3 model. For the first time, a simple human-nature interaction model is made available in Modelica that distinguishes between dynamics of Elite and Commoner social groups. It is shown that Handy can reproduce rather complex behavior with a very simple model structure, as compared to that of world models like World3.

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An interesting feature of Handy is that it introduces the accumulation of economic wealth, and divides the human population into rich and poor according to their unequal access to available wealth...

Social inequality is not only explicitly considered but also plays a key role in the sustainability analyses of the model. This makes Handy the first model of its kind that studies the impacts of inequality on the fate of societies, a capability seldom found even in complex world models.

Handy establishes a useful general framework that allows carrying out 'thought experiments' about societal collapse scenarios and the changes that might avoid them.

The model is a very strong simplification of the human-nature system, which results in many limitations. Despite its simplicity, such a model is easy to understand and offers a more intuitive grasp of underlying dynamical phenomena compared to more complex and less aggregated models.

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"Although models presented in this paper are from different classes (minimal Handy vs. more complex, realistic world model, World3), their conclusions are similar. In the long run, not so far into the future, humanity must change to living sustainably on planet Earth. This change can occur either as a planned gradual transition, preserving well-functioning societies, or as a more disruptive, unplanned transition resulting in a less pleasant society with a reduced ecological capacity."" (https://www.theguardian.com/environment/earth-insight/2014/mar/21/climate-change-scienceofclimatechange)