This unit aims to expose students to the key principles of economic and environmental sustainability of agricultural and marine systems in Australia. The unit addresses economic issues such as scarce resource allocation, ways of allocating resources: Cost benefit analysis, Gross Margin analysis; Growing world-wide emphasis on market-based solutions and consumerism. Then the unit moves to examining key concepts of sustainable plant and animal agriculture/aquaculture and methods for describing these production systems at a landscape level. The final section of the unit will include a choice of one of three modules (specific to the degree of enrolment) that will focus on the science behind the monitoring, description and manipulation of these systems: ie agricultural physics, marine management and landscape description.