Principles of Ecologically Sustainable Development - TCE Environmental Science (Tasmania)
“Explain the principles of ecologically sustainable development, including the precautionary principle, intergenerational and intragenerational equity, and conservation of biodiversity, and apply them to environmental decisions.”
Ecologically sustainable development means using resources to meet present needs without preventing future generations from meeting theirs. It rests on a set of principles: the precautionary principle, which says lack of full scientific certainty should not delay action to prevent serious harm; intergenerational equity, fairness to future generations; intragenerational equity, fairness among people alive today; and the conservation of biodiversity and ecological integrity. These principles guide decisions that balance environmental, social and economic goals.
What this dot point is asking
This dot point asks you to explain the guiding principles of ecologically sustainable development and to apply them to real environmental decisions. You should be able to define each principle clearly, especially the precautionary principle and the two forms of equity, and use them to argue how a Tasmanian or Australian decision should be made. This is the conceptual core of the management criterion of the course.
What ecologically sustainable development means
Ecologically sustainable development, often shortened to ESD, is development that meets the needs of the present without compromising the ability of future generations to meet their own needs. It tries to integrate three goals that are often in tension: protecting the environment, supporting a healthy economy, and meeting social needs. Rather than treating these as competing, ESD argues that long-term prosperity depends on a healthy environment, so decisions should serve all three together. Australia has adopted ESD principles in national strategy and environmental law.
Ecologically sustainable development is using, conserving and enhancing the community's resources so that ecological processes are maintained and the total quality of life, now and in the future, can be increased.
The precautionary principle
The precautionary principle addresses how to act when science is uncertain. It states that where there are threats of serious or irreversible environmental harm, a lack of full scientific certainty should not be used as a reason to postpone measures to prevent that harm. In other words, when the stakes are high and the science is incomplete, decision-makers should err on the side of caution rather than wait for proof of damage that may by then be impossible to reverse. This principle is often applied to decisions about pollution, fisheries and the approval of new developments where outcomes are hard to predict.
Equity: between and within generations
Two ideas of fairness sit at the heart of ESD. Intergenerational equity is fairness between present and future generations: we should not consume resources or degrade ecosystems in ways that leave future people worse off. Maintaining a stock of natural capital, such as forests, fisheries, soils and a stable climate, is a way of keeping faith with people not yet born.
Intragenerational equity, sometimes called social equity, is fairness among people alive today. The benefits and costs of using the environment should be shared fairly, so that some groups are not made to bear pollution or resource loss while others enjoy the benefits. Both forms of equity push decision-makers to look beyond short-term, narrow interests.
A frequent exam requirement is to distinguish the two forms of equity. Intergenerational equity is fairness across time, between present and future generations. Intragenerational equity is fairness across society today, among people living now. Define both and give an example of each to show you understand the difference.
Evaluate questions give a proposal with benefits and risks and ask whether it should proceed. Work through it in order.
Set out the benefits and risks
List the economic and social benefits (jobs, revenue) against the environmental risk, noting any chance of serious or irreversible harm. Quote the figures given.
Apply the precautionary principle
If there is a real risk of serious or irreversible harm under scientific uncertainty, state that this principle argues for caution or refusal unless the risk can be removed.
Apply both forms of equity
Use intergenerational equity to ask whether future generations are left worse off, and intragenerational equity to ask whether today's benefits and costs are shared fairly.
Reach a justified conclusion
Weigh the principles against the benefits and state a clear position (reject, or approve only with safeguards and monitoring), justified by the principles, not by personal preference.
Conserving biodiversity and ecological integrity
A further principle is the conservation of biodiversity and ecological integrity. Because biodiversity underpins the ecosystem services humans depend on, and because lost species and ecosystems cannot be recovered, maintaining the variety of life and the functioning of ecological processes is treated as a core goal of sustainable decisions, not an optional extra. This principle links ESD directly to the rest of the course, from biodiversity loss to ecosystem services.
Applying the principles to a Tasmanian decision
These principles are most powerful when applied to a real choice. Consider a proposal to expand salmon aquaculture in a sensitive Tasmanian waterway. The precautionary principle would argue for caution and strong monitoring where the effects on the seafloor and water quality are uncertain. Intergenerational equity would ask whether the waterway will still be healthy and productive for future Tasmanians. Intragenerational equity would consider how jobs, profits and environmental costs are shared among the industry, local communities and other water users. Conservation of biodiversity would weigh the risk to the species and habitats of the waterway. Weighing all of these, alongside the economic value of the industry, is what applying ESD looks like in practice.
Bringing it together
To answer this dot point well, define ecologically sustainable development as meeting present needs without compromising future generations, then define and explain the precautionary principle, intergenerational equity, intragenerational equity and biodiversity conservation. Show that you can apply them by working through a Tasmanian decision such as aquaculture expansion or forestry, weighing environmental, social and economic considerations together.
Students often frame ESD as the environment winning against the economy. ESD seeks to integrate environmental, social and economic goals for the long term, not to choose one over the others. Show that sustainable decisions balance all three, using the principles to guide that balance rather than simply favouring nature.
Exam-style questions
Questions in the style of TASC exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
Practice8 marksA proposed mine would create jobs and million in annual revenue, but scientific assessment estimates a chance of irreversible damage to a downstream wetland of high conservation value. Using ESD principles, evaluate whether the proposal should proceed and justify your reasoning.Show worked answer →
An 8 mark evaluate question rewards applying named ESD principles to the data and reaching a justified conclusion.
- Apply the precautionary principle
- There is a real () risk of serious and irreversible harm and scientific uncertainty about the outcome. The precautionary principle says uncertainty should not be used to delay protection, so it argues for caution or refusal unless the risk can be reduced.
- Apply intergenerational equity
- Irreversible wetland damage would deprive future generations of that ecosystem and its services, weighing against approval.
- Apply intragenerational equity
- Weigh how the jobs and million benefit some groups today while others bear the environmental cost.
- Reach a justified conclusion
- A defensible answer might reject the proposal, or approve it only with strong safeguards and monitoring that remove the irreversible-harm risk, justified by balancing the economic benefit against the precautionary principle and equity.
Markers reward correctly applying at least three principles to the figures and a reasoned, justified position.
Practice6 marksDistinguish between intergenerational and intragenerational equity, and give one example of each in an environmental decision.Show worked answer →
A 6 mark distinguish question wants the contrast plus two correct examples.
Intergenerational equity. Fairness between present and future generations: we should not degrade ecosystems in ways that leave future people worse off. Example: limiting fishing today so stocks remain for future generations.
Intragenerational equity. Fairness among people alive today: the benefits and costs of using the environment should be shared fairly. Example: ensuring a community downstream of a polluting industry is not made to bear costs while others enjoy the benefits.
Markers reward the across-time versus across-society distinction and one valid example of each.