Fig. 6. Community, politics and rnvironment. The reinforcing causal loop (R1) illustrates the social effects that may result when the community takes an interest in the environment. The reinforcing causal loop (R2) illustrates the effects that this interest may produce in the political domain. As actions in favour of the environment increase, so does the capacity of the Macquarie River to withstand extreme events or threat from detrimental human activities.