Human impact and environmental sustainability (SACE Stage 2 Outdoor Education)
“Analyse historical, current and potential human impacts on a natural environment and evaluate strategies for its sustainability and conservation.”
Human activity changes natural environments through clearing, grazing, pollution, introduced species, recreation and climate change. Sustainability means using an environment so that its ecological functions, biodiversity and resources remain available for future generations. You must analyse the past, present and likely future impacts on a real area such as the River Murray or Wilpena Pound, then evaluate the management strategies used to conserve it.
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What this dot point is asking
You must investigate human impacts on a chosen environmental area across three time frames and judge how effectively it is being managed. This requires both description of impacts and evaluation of strategies, not just a list.
Historical impacts
Every Australian environment has a layered history. First Nations peoples have managed Country for tens of thousands of years, including through cultural fire practices that shaped vegetation. European colonisation brought rapid change: land clearing for agriculture, introduced grazing animals, river regulation through locks and weirs, and the introduction of species such as rabbits, foxes, carp and weeds.
Along the River Murray, for example, locks and weirs altered the natural flooding cycle that River Red Gums depend on, while irrigation extraction reduced flows reaching the Coorong and Lower Lakes. Understanding this history explains the condition of the environment you observe today.
Using and managing an environment so that its biodiversity, ecological processes and natural resources are maintained over the long term, meeting present needs without compromising the ability of future generations to meet theirs.
Current impacts
Present-day impacts include recreation and tourism pressure, water extraction, salinity, pollution, weeds and feral animals, and the spread of soil-borne disease such as Phytophthora cinnamomi (root-rot fungus). Outdoor recreation itself causes impact: track erosion, trampling of vegetation, soil compaction, disturbance of wildlife, and waste. Concentrated use at popular sites like the Murray River or coastal dunes can exceed what the environment can absorb.
Carrying capacity is the maximum level of use an environment can sustain without lasting degradation. Exceeding it, whether through too many visitors or too much grazing, causes erosion, loss of vegetation and declining biodiversity that the system cannot quickly recover from.
Potential (future) impacts
Future impacts include climate change (rising temperatures, altered rainfall, more intense fire and drought), continued population and tourism growth, and the cumulative effect of many small disturbances. Climate projections for South Australia suggest hotter, drier conditions that will stress water-dependent ecosystems such as wetlands and increase fire risk in mallee and forest. Anticipating these helps managers plan adaptive strategies now.
Management and conservation strategies
You must evaluate, not just describe, the strategies used to conserve your chosen area. Common strategies include:
- Protected areas and zoning such as national parks, wilderness protection areas and Marine Parks that limit damaging activities.
- Water management such as environmental flows released to mimic natural flooding for River Red Gums and waterbird breeding.
- Pest and weed control such as fox baiting, carp management and revegetation with local native species.
- Visitor management such as designated tracks, boardwalks, permits, fire bans, and Leave No Trace education.
- First Nations partnership through co-management and the return of cultural burning.
Evaluation means judging effectiveness: Does the strategy address the root cause or only the symptom? Is it adequately funded and enforced? What are its trade-offs? For instance, building boardwalks protects fragile dunes but concentrates use and costs money; environmental flows help wetlands but compete with irrigation demand.
Sustainability principles for outdoor users
As an outdoor educator and user you apply minimal-impact principles: stay on tracks, carry out all waste, use fuel stoves rather than fires where required, keep groups small, and respect cultural sites. These behaviours reduce your own contribution to the impacts you analyse, linking your fieldwork directly to the sustainability of the places you visit.
Step 1: Choose the environment and set the frames
Take the Coorong and Lower Lakes. Set out the three frames: historical, current and potential, so impacts are not all treated as if they happened at once.
Step 2: Identify the historical impact
River regulation and land clearing from colonisation altered flows and cleared vegetation, beginning the decline of the wetland system. State the cause and the effect.
Step 3: Identify the current impact
Today, water extraction and drought keep flows low, raising salinity and degrading habitat for fish and waterbirds, while tourism adds local pressure. Link each cause to its effect.
Step 4: Project the potential impact and judge management
Climate projections of hotter, drier conditions will further stress the system. Evaluate whether environmental flows and pest control address these causes or only symptoms, and conclude with a judgement on sustainability. Separating the frames and evaluating, not just listing, is the high-mark structure.
A common error is only describing impacts and strategies rather than analysing and evaluating them. The dot point asks you to judge how well strategies work, considering causes, trade-offs and effectiveness, and to distinguish historical, current and potential impacts. Listing problems without weighing the management response, or treating all impacts as if they happened at once, will limit your grade.
Assessment-style questions
Questions on this dot point, each with a worked answer, written by ExamExplained. Outdoor Education has no written exam, so use them to check your understanding before your assessment tasks.
Practice4 marksSource-based: A report on the River Murray notes that locks and weirs altered natural flooding and that environmental flows are now released. Analyse one historical and one current human impact on this environment.Show worked answer →
Four marks: one historical impact (about 2 marks) and one current impact (about 2 marks), each analysed.
Historical: locks and weirs built for navigation and irrigation altered the natural flooding cycle that River Red Gums and waterbirds depend on, so trees became stressed and breeding declined (2 marks).
Current: ongoing water extraction for irrigation reduces flows reaching the Coorong and Lower Lakes, raising salinity and degrading habitat, while environmental flows are now used to partly restore flooding (2 marks).
Strong answers distinguish the time frames and explain the mechanism, not just name the impact.
Practice6 marksExtended response: Evaluate the strategies used to manage human impact on a chosen Australian environment, considering whether they address causes and their trade-offs.Show worked answer →
Six marks reward evaluation with criteria and a judgement.
Name the environment and its main human impacts across time frames (about 1 mark).
Evaluate two or three strategies (for example environmental flows, visitor management such as boardwalks, pest control) against criteria: do they address the root cause or only the symptom, are they funded and enforced, what are the trade-offs (about 3 marks). For example, boardwalks protect dunes but concentrate use and cost money; environmental flows help wetlands but compete with irrigation.
Conclude with a judgement that effective management combines strategies addressing causes, is properly resourced, and adapts over time (about 2 marks).
Practise this
Sources & how we know this
- Stage 2 Outdoor Education subject outline (2025 onwards) — SACE Board
- Stage 2 Outdoor Education: external assessment — SACE Board