The six sustainability principles provide a framework for evaluating environmental management decisions. Applied rigorously, they transform abstract sustainability goals into concrete criteria for assessing whether management strategies are adequate.
| Principle | One-line Summary |
|---|---|
| Conservation of biodiversity and ecological integrity | Maintain living systems and their processes |
| Efficiency of resource use | Maximise benefit per unit of resource consumed |
| Intergenerational equity | Preserve options for the future |
| Intragenerational equity | Fair distribution in the present |
| Precautionary principle | Act cautiously under uncertainty |
| User pays principle | Those who cause harm bear the cost |
Management strategies should maintain or restore:
- Species diversity and population viability
- Habitat extent and quality
- Ecological processes (nutrient cycling, water flow, fire regimes)
- Resilience — the capacity of ecosystems to absorb disturbance
Test question: Does this management strategy maintain ecological processes, or does it merely slow their degradation?
Example application: A water management plan that allocates environmental flows for ecological purposes uphold this principle; one that only allocates water for human use does not.
Management resources (funding, time, personnel) are finite. Efficiency means:
- Targeting interventions where they deliver greatest ecological benefit
- Using technologies that reduce waste (e.g. precision agriculture reducing fertiliser runoff)
- Integrated pest management rather than blanket pesticide application
- Life-cycle analysis to minimise environmental impact of products
Example application: Controlling a key feral predator species (e.g. foxes) in a region protects dozens of native species simultaneously — highly efficient compared to single-species management.
Management strategies should:
- Avoid irreversible actions (extinctions, permanent soil degradation)
- Maintain renewable resources within sustainable yield
- Apply long-term planning horizons (decades to centuries)
- Invest in ecological rehabilitation to improve conditions for the future
Example application: A 20-year forest management plan that maintains a network of old-growth reserves upholds intergenerational equity; one that converts all old growth to plantation harvested every 30 years does not.
Management strategies should:
- Distribute the costs and benefits of environmental management fairly
- Engage marginalised communities (Indigenous peoples, low-income groups) in decision-making
- Not require poorer nations or communities to bear disproportionate conservation costs
- Provide compensation where livelihoods are affected by conservation restrictions
Example application: A marine park that restricts commercial fishing without compensating affected fishers, while allowing recreational fishing to continue, raises intragenerational equity concerns.
Where there is scientific uncertainty about potential harm, management should:
- Err on the side of caution before authorising potentially harmful activities
- Not delay protective action waiting for complete certainty
- Require proponents of potentially harmful activities to demonstrate safety
Trigger conditions: The precautionary principle is most relevant when potential harm is:
- Severe (significant ecological or health impacts)
- Irreversible (extinction, permanent habitat destruction)
- Uncertain (not yet fully understood)
Example application: When a new pesticide is proposed for broad-scale application near a Ramsar wetland, the precautionary principle supports requiring comprehensive environmental impact assessment before approval, even if short-term data does not show obvious harm.
Management strategies should ensure:
- Polluters pay for remediation of harm caused
- Resource extractors pay for habitat rehabilitation
- Developers fund biodiversity offsets equivalent to losses caused
- Full environmental costs are reflected in market prices
Policy instruments: Carbon taxes; mining rehabilitation bonds; discharge licences; nutrient trading schemes; biodiversity offsets.
Example application: Requiring mining companies to post a rehabilitation bond before commencing operations ensures they bear the cost of site restoration rather than leaving it to taxpayers.
Real-world management decisions often involve trade-offs:
| Tension | Example |
|---|---|
| Efficiency vs. Intragenerational equity | Prioritising ‘high-value’ ecosystems may neglect disadvantaged communities’ local environments |
| Conservation vs. Intragenerational equity | Strict protection limits local economic activities |
| User pays vs. Precautionary principle | Full cost recovery may deter innovation in clean technology |
EXAM TIP: When evaluating a management strategy, systematically work through all six principles rather than focusing on just one or two. Show that you understand the nuances — a strategy may uphold some principles while violating others.
