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2026-10-11

Quick-Fire Review: Systems, Feedback and Resilience

ESS Quick-Fire Review
ESS Quick-Fire Review@Soppy Luli
Quick-Fire Review: Systems, Feedback and Resilience

A lake can take water from every stream around it and still never rise, because it is losing just as much to the air and the outlet. Reading that balance is the first skill this course asks for.

0:00 / 8:02
This is a fast pass through the systems, feedback and resilience material in Environmental Systems and Societies, with eleven questions, each one followed by the answer and the reasoning that earns the mark.

What this review covers

Systems, storages and flows. What makes a set of parts a system, how to read a systems diagram, and the difference between a transfer and a transformation.
Open and closed systems. How energy and matter cross a boundary, and how to work out whether the water stored in a reservoir is rising or falling from its inputs and outputs.
Feedback loops. Why negative feedback steadies a system and positive feedback drives it away, with two examples taken straight from the climate.
Equilibrium, resilience and tipping points. Steady state against static equilibrium, what a regime shift looks like on a reef, and the property that keeps a system from tipping over.

How to use it

Answer each question before the host gives it away. The pause is there for exactly that. If you get one wrong, the reason that follows is the part worth repeating, because that is where the marks live.
The ones that catch people out are storage against flow, positive against negative feedback, and steady state against static. Each turns on a single distinction, so say the distinction out loud before you say the answer.
Replay the whole thing the night before, and once more on the way to the exam.
ESS Quick-Fire Review
ESS Quick-Fire Review@Soppy Luli

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