How can development be made sustainable so biodiversity is not lost?
the principles of ecological sustainability and how development can be managed using approaches such as the precautionary principle, intergenerational equity and ecologically sustainable development
A focused answer to the VCE Environmental Science Unit 3 dot point on ecological sustainability and the principles used to manage development, with Australian examples.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
VCAA wants you to define ecological sustainability, explain the principles used to guide development, and show how they balance human needs against protecting biodiversity. Use a clear definition, name the principle, and support it with an Australian example.
What ecological sustainability means
Sustainability is meeting the needs of the present without compromising the ability of future generations to meet their own needs. Ecological sustainability focuses on keeping ecosystems and their services functioning indefinitely: not harvesting resources faster than they regenerate, not producing waste faster than it can be absorbed, and maintaining biodiversity.
A common way to picture this is the triple bottom line: decisions should be environmentally sound, socially fair and economically viable at the same time. True sustainability sits where all three overlap.
Key principles for managing development
- Ecologically sustainable development (ESD)
- ESD is using, conserving and enhancing resources so that ecological processes are maintained and the total quality of life can be improved now and in the future. It is embedded in Australian law, including the federal Environment Protection and Biodiversity Conservation (EPBC) Act, which requires major projects to be assessed for their impact on matters of national environmental significance.
- The precautionary principle
- Where there is a threat of serious or irreversible environmental damage, a lack of full scientific certainty should not be used as a reason to postpone action to prevent that damage. In other words, act cautiously when consequences could be severe even if the science is not yet complete. This principle has been applied in decisions to limit fishing quotas and to restrict activities near sensitive habitats such as the Great Barrier Reef.
- Intergenerational equity
- The present generation should maintain the health, diversity and productivity of the environment for the benefit of future generations. Clearing old-growth forest or driving a species extinct removes options that future people can never recover.
- Intragenerational equity
- Fairness within the present generation also matters: the costs and benefits of development should be shared fairly, including with Aboriginal communities and others who depend directly on the land.
- Conservation of biodiversity and ecological integrity
- Maintaining the variety of life and the processes that sustain it is treated as a core goal of decision-making, not an optional extra.
Tools that put the principles into practice
Governments use several tools to manage development against these principles. Environmental impact assessments evaluate a project's likely effects before approval. Environmental management systems set targets and monitor performance. Triple-bottom-line reporting forces consideration of environmental and social outcomes alongside profit. Setting sustainable harvest limits (such as fishing quotas based on maximum sustainable yield) keeps resource use within natural regeneration rates.
A practical Australian example is the management of the Murray-Darling Basin. The Basin Plan tries to balance irrigation for agriculture (economic and social needs) against environmental water flows needed to keep wetlands, fish and birds healthy (ecological needs), illustrating both intergenerational equity and the difficulty of achieving the triple bottom line in practice.
Exam-style practice questions
Practice questions written in the style of VCAA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
2025 VCAA4 marksA farming family converted an 8 hectare former cattle property into an organic market garden, using natural fertilisers, minimal irrigation and biological pest control. Does this conversion from cattle grazing demonstrate the sustainability principles of 'efficiency of resource use' and 'intergenerational equity'? Justify your response by explaining the meaning of each term in the context of this development.Show worked answer →
Two marks per principle: define it, then apply it to the market garden.
Efficiency of resource use (2 marks): using resources so that the maximum benefit is gained from the minimum input, with little waste. The garden demonstrates this by minimising irrigation water, recycling nutrients through green compost and manure rather than manufactured fertiliser, and planting legumes that add nitrogen naturally, so fewer external resources are consumed. So yes, it demonstrates this principle.
Intergenerational equity (2 marks): meeting present needs while maintaining the environment's health and productivity for future generations. By restoring degraded soil, revegetating the creek and avoiding chemical pesticides, the family protects long-term soil and water quality so future generations inherit productive, healthy land. So yes, it also demonstrates intergenerational equity.
2022 VCAA6 marksA council has proposed building a water park next to a healthy river. As part of the environmental management process, how should a risk analysis tool and the precautionary principle be used to help determine the suitability of a site for the water park? Clearly explain the terms 'risk analysis' and 'precautionary principle' in your response.Show worked answer →
A 6 mark answer defines both terms and explains how each guides the site decision.
Risk analysis (about 3 marks): the process of identifying potential hazards of the development (for example reduced river flow, pollution of the river, loss of riverbank habitat), then assessing each by the likelihood it occurs and the severity of its consequences. For the water park, this means systematically evaluating each site for these risks and how serious and likely the harm is, so the council can compare sites and put controls in place.
Precautionary principle (about 3 marks): where there is a threat of serious or irreversible environmental damage, a lack of full scientific certainty should not be used as a reason to postpone measures to prevent that damage. So if either site carries a credible risk of serious harm to the river ecosystem, the council should act cautiously, choosing the lower-risk site or adding safeguards rather than proceeding because the harm is not yet proven. Together the tools ensure the site chosen minimises serious and irreversible risk.