Models (14–16): Human effects on the environment

Global heating

When designing stock and flow models, you should shape the structure to what students would expect. And, where possible, add concrete elements. I think this model exemplifies these rules well and has proven to be a very successful model in my classroom.

Eutrophication

This model begins at the top left and finishes with the positive feedback loop. It’s a lesson I describe in Difference Maker.

Biomagnification

I explain this model in Difference Maker.

Sampling biodiversity

Learn how to teach variables with causal diagrams here.

Fish farming

This lesson takes full advantage of the population stock and flow model that, by this point, has appeared several times in the course: for example, in ecology and in immunity.

Learn how to teach this way in my books: