Exploring short-term and long-term time frames in Australian population carrying capacity assessment

Time frames are vital determinants in carrying capacity assessment modelling, but their quantification can be problematic. A strictly literal definition of sustainable carrying capacity implies calculating the maximum number of people a landscape can support in perpetuity. However, the concept of perpetuity, representing infinite time, renders the concept impractical, if not impossible, to quantify; so a more pragmatic approach can be to perform assessments for a range of time frames in order to establish potential trends. One Australian-orientated model, the Carrying Capacity Dashboard, was developed to begin exploring temporal flexibility in resource-based carrying capacity modelling. It offers users the ability to choose projected time frames of between one and 150 years for a variety of landscape scales and consumption patterns. Generally, the longer time frames resulted in reduced carrying capacities. One reason for this result is that a completely self-sufficient population would need to match its consumption and hence its size to the anticipated least productive year within any given time frame; and as projected time periods increase, the likelihood of encountering more extreme climatic conditions with smaller yields increases.