Evaluate models of sustainable resource use, including but not limited to ecological footprint, life cycle assessment, the circular economy and Aboriginal and Torres Strait Islander land-management practices in the Australian context

What this dot point is asking

NESA wants you to evaluate how resource use can be made sustainable, using the tools and models that measure and guide it (ecological footprint, life cycle assessment, the circular economy) and the long-standing land-management knowledge of Aboriginal and Torres Strait Islander peoples. The command word evaluate means weighing how useful each model is and reaching a judgement, with Australian examples.

The answer

Sustainability means using resources to meet present needs without preventing future generations from meeting theirs. Because Earth's resources and its capacity to absorb waste are finite, sustainable management seeks to keep resource use within the limits of natural replenishment and to minimise impact. Several models help measure and guide this, and Aboriginal land management offers tens of thousands of years of sustainable practice.

Ecological footprint

The ecological footprint estimates the area of productive land and sea needed to supply a person's or nation's resource use and absorb their waste. It is a useful communication tool: it shows that if everyone consumed like an average Australian, several Earths would be needed, highlighting overconsumption. Its limitation is that it is an estimate based on broad assumptions and treats very different impacts as a single area figure, so it indicates scale rather than precise impact.

Life cycle assessment

Life cycle assessment evaluates the environmental impact of a product across its whole life, from raw-material extraction through manufacture, use and disposal (cradle to grave). It prevents misleading conclusions: an electric vehicle has no exhaust emissions but its battery requires mining and energy to make, so a full assessment is needed to compare it fairly with alternatives. Its strength is comprehensiveness; its limitation is that it is data-hungry and depends on the assumptions and boundaries chosen.

The circular economy

The traditional economy is linear: take, make, use, dispose. A circular economy keeps materials in use through reuse, repair, remanufacturing and recycling, designing out waste so that the output of one process becomes the input of another. Australia's container deposit schemes (such as Return and Earn in New South Wales) and growing recycling and product-stewardship requirements move in this direction. The circular economy reduces both resource extraction and waste, though it requires design changes, infrastructure and behaviour change to work at scale.

Aboriginal and Torres Strait Islander land management

Aboriginal and Torres Strait Islander peoples managed Australian land and resources sustainably for tens of thousands of years. Cultural (cool) burning uses frequent, low-intensity, patchy fires to reduce fuel loads, encourage food plants and protect habitat; it is now being reintroduced into formal fire management and savanna-burning programs that also generate carbon credits. Seasonal calendars guided when to harvest particular plants and animals so that populations were not depleted, an early form of sustainable yield. Recognising this knowledge as legitimate science, and incorporating it into modern land and fire management, is explicitly part of this module.

Try this

Q1. Explain why life cycle assessment gives a fairer comparison of two products than looking at their use stage alone. [3 marks]

• Cue. It includes extraction, manufacture, use and disposal, so impacts hidden outside the use stage (such as battery mining) are counted.

Q2. Evaluate the contribution of Aboriginal cultural burning to sustainable land management in Australia. [4 marks]

• Cue. Frequent low-intensity burning reduces fuel, supports biodiversity and is being reintegrated into fire and savanna management; supported judgement that it is effective, evidence-based management complementing modern methods.