The 3-machines energy transition model is a global system dynamics model based on energy balances,  and used to explore the energy frontiers for stabilizing the Earth's climate. The model comprises a hypothetical fossil engine, a solar engine including energy storage, and a carbon scrubber. These machines interact with Earth's carbon cycle and satisfy humanity’s energy demand. A detailed description can be accessed here: https://osf.io/fcwt8/

Changes to V19: calculation of energy investments set on base and additional materials, not materials as a fraction of a total

Perspective taking reveals aspects of complex systems.  This is a natural starting point for systemic investigations, since one can only see aspects of complex systems and never the entire system. The graph shows that investigating these aspects to get a deeper understanding requires  examining them through appropriate interpretive concepts of which systems thinking has many to offer. However, not all systems thinking methodologies concentrate on the investigation the dynamic feedback mechanism of systems. Systems thinking methodologies that ignore feedback mechanisms  do  not possess  a suitable contextual vocabulary for their investigation, and as a result do not offer any advantage over other  investigative methodologies when it comes to investigating the dynamic systems that are traditionally the target of systemic investigation.

This is a reconstruction of the SIMM model presented in Chapter 2 of Feedback Economics (Contemporary Systems Thinking)

Causal loop representations of macroeconomics taken from the System Dynamics literature contrasted with Forrester's main analysis of social and business organization layers See also Saeed's Forrester Economics IM-183285