Consider the following "Sustaining the Forest" model intended to provide another example of how unexpected the behavior of a web of extended interactions can be.

The interaction of a population of Moose and Wolves.

The interaction of a population of Moose and Wolves.

The interaction of a population of Moose and Wolves.

The limits to growth structure is based on the basic growth structure. And, as should be obvious, nothing grows forever as growth requires resources. Those required resources become a limits to growth.