The effects or deer & possum on forest carbon 

A Tragedy of the Commons situation exists whenever two or more activities, each, which in order to produce results, rely on a shared limited resource. Results for these activities continue to develop as long as their use of the limited resource doesn't exceed the resource limit. Once this limit is reached the results produced by each activity are limited to the level at which the resource is replenished. See also Archetypes.

An environmental concept model based on the 1977 Raikura/Stewart Island conversation programme. No birds were harmed in the making of this model.

The effects or deer & possum on forest carbon 

WIP Based on reading around multilevel cultural selection leading to Royal Society Special Issue 2012  New thinking: the evolution of human cognition