Climate Change and People (SACE Stage 2 Geography Environmental Change)
“Explain how human activity contributes to climate change, analyse the uneven environmental, social and economic impacts, and evaluate mitigation and adaptation strategies.”
Climate change is the long-term shift in temperature and weather patterns, now driven mainly by human emissions of greenhouse gases from burning fossil fuels, clearing land and agriculture. SACE answers must explain how people contribute to it, analyse why its impacts are uneven across places and social groups, and evaluate two responses: mitigation (cutting emissions) and adaptation (adjusting to impacts), using real Australian and global cases.
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What this dot point is asking
This dot point closes Topic 1, Environmental Change. The key geographical idea is that both the causes and the consequences of climate change are unevenly distributed. The countries that emit the most are often not the ones that suffer the worst impacts, which is why questions of equity sit at the centre of strong answers.
How people contribute to climate change
The enhanced greenhouse effect occurs when extra greenhouse gases trap more outgoing heat. The main human sources are burning coal, oil and gas for electricity and transport, land clearing that releases stored carbon, and methane from livestock and rice. Global carbon dioxide concentration has risen from about 280 parts per million before industrialisation to over 420 parts per million today, and the world has warmed roughly 1.1 to 1.2 degrees Celsius since pre-industrial times.
Australia has one of the highest per-person emission rates among developed nations because of its coal-heavy electricity, long transport distances and resource exports. This makes Australia a useful case for discussing responsibility.
Uneven spatial and social impacts
Climate impacts vary by place and by vulnerability.
- Low-lying Pacific nations such as Tuvalu and Kiribati face sea-level rise, saltwater intrusion and the loss of habitable land, despite contributing almost nothing to global emissions.
- In Australia, the Murray-Darling Basin faces more frequent and severe drought, threatening irrigation, towns and river ecosystems, while northern Australia faces more intense cyclones.
- Marine heatwaves have caused repeated mass coral bleaching on the Great Barrier Reef (2016, 2017, 2020, 2022 and 2024), damaging tourism and fisheries.
- The 2019-2020 Black Summer bushfires, made more likely by hotter, drier conditions, burned over 18 million hectares.
The wealthiest countries and highest emitters generally have the most resources to adapt, while many low-emitting developing nations are the most exposed and least able to respond. This mismatch between who causes climate change and who suffers from it is the equity argument that lifts a SACE answer from describing impacts to analysing them.
Consequences across the three systems
Environmentally, warming drives sea-level rise, ecosystem shifts, coral bleaching and more extreme droughts, floods and fires. Socially, it threatens food and water security, displaces people (creating climate migrants), and harms health through heatwaves. Economically, it raises insurance and disaster-recovery costs, disrupts agriculture and tourism, but also creates jobs in renewable energy and adaptation industries.
Mitigation and adaptation strategies
Mitigation reduces or removes greenhouse gases. Examples include shifting to solar and wind (South Australia regularly meets a very large share of its electricity demand from renewables), electrifying transport, restoring forests, and international agreements such as the Paris Agreement, which aims to keep warming well below 2 degrees Celsius. Mitigation tackles the cause but needs global cooperation and time to take effect.
Adaptation adjusts to impacts that are already locked in. Examples include sea walls and managed retreat in coastal towns, drought-resistant crops, better cyclone-proof building codes, and water-trading reforms in the Murray-Darling Basin. Adaptation protects communities now but does not stop warming and can be very expensive for poorer nations.
Do not confuse mitigation with adaptation, and do not just describe impacts. Mitigation cuts emissions; adaptation copes with effects. The dot point asks you to evaluate both, so weigh their strengths and limits with evidence rather than listing them. Top answers also address the equity gap between high emitters and the most vulnerable.
A 10 mark evaluate question rewards a structured comparison of mitigation and adaptation. Work it in steps.
Step 1: define and separate the two responses
State that mitigation cuts the cause (emissions) while adaptation manages the effects. Keeping them distinct prevents the most common error in these questions.
Step 2: pair an Australian and a global example to each
For mitigation use South Australia's renewables and the Paris Agreement; for adaptation use Murray-Darling water reforms and Pacific sea walls. A paired local and global case gives the range examiners expect.
Step 3: weigh strengths against limits
Mitigation tackles the root cause but is slow and needs cooperation; adaptation protects now but is costly and does not stop warming. State each trade-off explicitly with evidence.
Step 4: judge with equity in mind
Conclude that both are required and note who can afford each, since high emitters can adapt more easily than the most exposed low emitters. A clear weighed verdict tied to equity is what lifts the marks.
Linking it together
A complete response explains the human causes of climate change with emissions data, maps uneven impacts from the Pacific to the Murray-Darling Basin, follows consequences through environmental, social and economic systems, and evaluates both mitigation and adaptation while addressing equity. That structure matches the geographical skills and applications criteria the SACE Board assesses.
Exam-style questions
Questions in the style of SACE Board 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.
Practice6 marksUsing data you have studied on greenhouse gas emissions per person and exposure to climate impacts for a range of countries, analyse the relationship between emissions and vulnerability, and explain why this raises questions of equity.Show worked answer →
A 6 mark source-and-explain response needs accurate data reading, an analysed relationship, then the equity link.
Read the data. State the pattern: high-emitting developed countries such as Australia and the United States show high per-person emissions but relatively low exposure, while low-emitting nations such as Pacific states show the reverse.
Analyse the relationship. Argue that there is an inverse relationship between contribution and vulnerability: those least responsible are often the most exposed and least able to adapt, citing figures from the data.
Explain the equity issue. Link this mismatch to fairness: the countries causing warming are not those bearing its worst impacts, which underpins arguments for climate finance and loss-and-damage support. Markers reward exact use of the supplied figures and a clear move from pattern to equity.
SACE 2023-style10 marksEvaluate the effectiveness of mitigation and adaptation strategies in responding to climate change. Refer to an Australian example and a global example.Show worked answer →
A 10 mark response needs both strategy types, paired examples and a judgement on effectiveness.
Mitigation. Define mitigation as cutting or removing emissions and evaluate examples such as South Australia's shift to renewables and the Paris Agreement, noting strengths (tackles the cause) and limits (needs global cooperation and time).
Adaptation. Define adaptation as adjusting to locked-in impacts and evaluate examples such as Murray-Darling water-trading reforms and Pacific sea walls or managed retreat, noting strengths (protects communities now) and limits (expensive, does not stop warming).
Judgement. Conclude that both are needed: mitigation to limit future warming, adaptation to manage unavoidable impacts, with equity shaping who can afford each. Markers reward a paired local and global case, a balance of both strategies, and a clear weighed position.
Practise this
Sources & how we know this
- Stage 2 Geography subject outline (2025 onwards) — SACE Board
- Stage 2 Geography: external assessment — SACE Board