Codes of published system-dynamics models of global catastrophes, doomsday scenarios, and other existential risks.

Rworld2: Translation of the World2 model from DYNAMO to R, based on the source codes given in Forrester (1971), chapter 3 and appendix B. The World2 model can be considered the first computer-based doomsday model. It is a 5th-order differential equation model with population, natural resource, capital investment, capital-investment-in-agriculture fraction, and pollution as main variables. The R code has been benchmarked against Fig. 4-1 of Forrester (1971). Read more in Mignan (2020).

PyWorld3: Extension of World2, more complex, discussed in 'The Limits to Growth' (Meadows et al., 1972; Meadows, 1974), developed by Charles Vanwynsberghe in response to Rworld2 - see repo cvanwynsberghe/pyworld3. Read more in Vanwynsberghe (2021).

Forrester JW (1971), World Dynamics. Wright-Allen Press, Inc., Cambridge, 144 pp.

Meadows DH, Meadows DL, Randers J, Behrens III WW (1972), The Limits to Growth. Universe Books, New York, 205 pp.

Meadows DL (1974), Dynamics of Growth in a Finite World. Wright-Allen Press, Cambridge, 637 pp.

Mignan A (2020), World2 model, from DYNAMO to R. Towards Data Science, Medium

Vanwynsberghe C (2021), Exploring the Limits to Growth with Python, A glimpse of PyWorld3 & PyWorld2. Towards Data Science, Medium