OCR A-Level Geography Geographical debates (03), June 2025: Question 11
33 marks · Hard difficulty · Extended Response
Discuss the extent to which climate modelling is essential for an effective human response to climate change.
Practise this questionQuestion
Question text
‘Climate modelling is essential for an effective human response to climate change.’
Discuss. [33]
Mark scheme
Show the mark scheme
Question Answer Mark Guidance
‘Climate modelling is essential for an effective human 33 Indicative content AO1 – 9
response to climate change.’ Discuss. AO1 x9 marks
AO2 x24
AO1 Demonstrating knowledge and understanding of effective human
Level 4 (7–9 marks) responses to climate change could potentially include:
Demonstrates comprehensive knowledge and understanding • Climate modelling
of effective human responses to climate change. o To predict what future climates might be
o Understanding importance of carbon cycle,
Level 3 (5–6 marks) positive and negative feedback, future emission
Demonstrates thorough knowledge and understanding of scenarios and impacts
effective human responses to climate change. • Impacts of climate change are global, regional and local
and dynamic.
Level 2 (3–4 marks) • Mitigation and adaptation responses
Demonstrates reasonable knowledge and understanding of o Mitigation to cut greenhouse gas emissions
effective human responses to climate change. (energy efficiency and conservation; fuel shifts
and low-carbon energy sources; carbon capture
Level 1 (1–2 marks)
+ storage; geoengineering such as stimulating
Demonstrates basic knowledge and understanding of effective
phytoplankton growth in oceans; forestry)
human responses to climate change.
o Adaptation to reduce vulnerability of human
0 marks populations at risk e.g. retreat, accommodate,
No response or no response worthy of credit. protect.
• International policies e.g. IPCC, Kyoto, Paris, Glasgow,
AO2 Baku meetings in responding to climate change.
Level 4 (19–24 marks)
Demonstrates comprehensive application of knowledge and
understanding to provide a clear, developed and convincing
analysis that is fully accurate of how climate modelling is AO2 – 24 marks
essential for an effective human response to climate change. Application of knowledge and understanding to analyse and
evaluate the extent to climate modelling is essential for an effective
Demonstrates comprehensive application of knowledge and human response to climate change could potentially include:
understanding to provide a detailed and substantiated • Expect wide range of effective human response e.g.
evaluation that offers secure judgements leading to rational cost, duration, ease of implementation, geographic scale,
conclusions that are evidence based as to the extent to which environmental impact, ability to implement across
climate modelling is essential for an effective human response development continuum or other appropriate perspective
to climate change. e.g., urban – rural + regional and local.
Mark Scheme June 2025
Relevant concepts are authoritatively discussed.
Carbon modelling essential:
Level 3 (13–18 marks) o Without modelling cannot appreciate impact,
Demonstrates thorough application of knowledge and concern, how the carbon cycle works to create
understanding to provide a clear and developed analysis that effective response.
shows accuracy of how climate modelling is essential for an o Ability to model impacts from past and then into
effective human response to climate change. future on vulnerable areas / people / species. As an
aid to decisions about resource allocation e.g.
Demonstrates thorough application of knowledge and protection strategies such as flood barriers – cost
understanding to provide a detailed evaluation that offers benefit analysis.
generally secure judgements, with some link between rational o Can encourage urgency to act e.g. spur for
conclusions as to the extent to which climate modelling is international directives / action.
essential for an effective human response to climate change.
Relevant concepts are discussed but this may lack some Carbon modelling not essential
authority. o Adaptation strategies part of evolving technology and
demand for increasingly resilient society. Additional
Level 2 (7–12 marks) strategies to mitigation – adjustments to actual
Demonstrates reasonable application of knowledge and changes and those anticipated – deals with both
understanding to provide a sound analysis that shows some risks and opportunities
accuracy of how climate modelling is essential for an effective o Retreat strategies – locations already experiencing
human response to climate change. impacts e.g. rising risks of coastal + river valley
flooding → managed realignment + zoning.
Demonstrates reasonable application of knowledge and o Accommodation + protection strategies already
understanding to provide a sound evaluation that offers encouraged e.g. water supply industries → ↑
generalised judgements and conclusions, with limited use of reservoir capacity; ↓ leakage. Agriculture →
evidence as to the extent to which climate modelling is essential conserving soil moisture (zero tillage; drought
for an effective human response to climate change. resistant crops). Health → education re risks from
extreme events e.g. heat or cold. Locations already
Concepts are discussed but their use lacks precision. experiencing impacts need responses today e.g.
flood barriers; health screening for migrating
disease
Level 1 (1–6 marks) o Opportunities – changes in land-use already
Demonstrates basic application of knowledge and responding to current climate changes e.g.
understanding to provide a simple analysis that shows limited expansion of viticulture in UK
accuracy of how climate modelling is essential for an effective
human response to climate change.
Demonstrates basic application of knowledge and
understanding to provide an un-supported evaluation that offers
Mark Scheme June 2025
simple conclusions as to the extent to which climate modelling
is essential for an effective human response to climate change.
Concepts are not discussed or are so inaccurately.
0 marks
No response or no response worthy of credit.
Quality of extended response Level 4
There is a well-developed line of reasoning which is clear and
logically structured. The information presented is relevant and
substantiated.
Level 3
There is a line of reasoning presented with some structure. The
information presented is in the most-part relevant and
supported by some evidence.
Level 2
The information has some relevance and is presented with
limited structure. The information is supported by limited
evidence.
Level 1
The information is basic and communicated in an unstructured
way. The information is supported by limited evidence and the
relationship to the evidence may not be clear.
How to answer it
Evaluating the Role of Climate Modelling in Human Responses [33 Marks]
📋 What this question tests
This synoptic 33-mark essay evaluates your ability to debate the critical necessity of General Circulation Models (GCMs) versus other socio-economic, political, and technological determinants of human mitigation and adaptation.
- AO1 (9 Marks): Depth and accuracy of knowledge regarding climate modelling, carbon cycle dynamics (feedbacks, Representative Concentration Pathways [RCPs]/Shared Socioeconomic Pathways [SSPs]), mitigation strategies (e.g. CCS, afforestation, renewable transitions), adaptation pathways (protect, accommodate, retreat), and international governance frameworks (IPCC, Paris Agreement, COP summits).
- AO2 (24 Marks): Quality of critical debate, balance, and evaluation. You must directly assess the extent to which modelling is essential compared to financial capital, political will, technological viability, and local/indigenous reactive adaptation.
Question 11* Essay Breakdown
‘Climate modelling is essential for an effective human response to climate change.’ Discuss. [33]
📐 Mark Scheme & Weighting Distribution
This is an extended, asterisked essay marked across 4 levels. Notice the disproportionate emphasis on AO2:
| Objective | Marks | Level 4 Descriptor Threshold |
|---|---|---|
| AO1 (Knowledge) | 9 | Comprehensive, accurate, authoritative case details and conceptual depth (7–9 marks). |
| AO2 (Evaluation) | 24 | Detailed, substantiated, clear line of reasoned argument leading to a robust, nuanced judgment (19–24 marks). |
| Total | 33 | Targeting Level 4 requires minimum 26/33 overall. |
Tip: Do not spend 60% of your time describing climate models. 73% of marks reward evaluation of their necessity compared to other drivers.
💡 Key Knowledge (AO1 Foundation)
- How Models Function: Atmosphere-Ocean General Circulation Models (AOGCMs) couple radiative forcing, thermodynamic atmospheric equations, oceanic thermohaline circulation, and terrestrial carbon-nitrogen exchanges.
- Feedback Mechanics: Crucial for anticipating non-linear tipping points:
• Positive: Arctic albedo loss; permafrost thawing releasing CH₄ and CO₂; ocean warming reducing CO₂ solubility.
• Negative: CO₂ fertilisation in tropical forests; increased low-altitude cloud reflectivity. - Mitigation Taxonomy: Decarbonisation, CCUS (Carbon Capture, Utilisation & Storage), bio-energy with CCS (BECCS), ocean iron fertilisation, and energy efficiency.
- Adaptation Typologies:
• Protect: Hard coastal barriers (e.g. Thames Barrier Phase 2, Dutch Delta Works).
• Accommodate: Drought-resistant GM crops (e.g. Scuba rice), drip irrigation, UK viticulture shifts.
• Retreat: Managed realignment (e.g. Medmerry, Sussex), small island relocation plans (e.g. Kiribati). - Global Policy Frameworks: IPCC Assessment Reports (AR6), UNFCCC COPs (Paris 1.5°C goal, Glasgow Climate Pact, Baku COP29 finance agreements).
✅ Arguments: Why Climate Modelling IS Essential
- Baseline for Long-Term Capital Infrastructure: Mega-engineering projects require precise sea-level and hydrological projections. The UK Environment Agency designed the Thames Estuary 2100 Plan specifically around IPCC and UKCP18 storm surge modelling to schedule modular barrier upgrades.
- Quantifying Carbon Budgets: Without GCMs coupling carbon sinks and emissions, policymakers could not calculate maximum permissible cumulative CO₂ emissions (e.g. remaining global budget of ~250 Gt CO₂ for a 50% chance of staying within 1.5°C).
- Spatial Targeting of Vulnerability: Identifies regional climate divergence (e.g. drying Mediterranean vs wetting Northern Europe; Sahel drought frequency), enabling targeted climate aid (e.g. Green Climate Fund allocation).
- Catalyst for International Diplomacy: IPCC consensus reports, driven by multi-model ensembles (CMIP6), dismantle climate denialism and establish legally binding reduction benchmarks across nations.
✅ Arguments: Why Modelling is NOT Sufficient / NOT Essential
- Reactive & Opportunistic Adaptation Works Independently: Farmers adjust planting seasons, switch cultivars, or adopt zero-tillage based on immediate seasonal weather experience, not supercomputer projections (e.g. expansion of commercial English vineyards in Kent).
- Implementation Bottlenecks: Having high-resolution models is meaningless without political will and capital funding. Developing nations (e.g. Bangladesh, Tuvalu) already understand their acute vulnerability; their primary barrier is lack of finance (loss and damage funds), not lack of data.
- Model Uncertainty & Resolution Limitations: Regional downscaling remains uncertain regarding extreme precipitation and cloud microphysics. Over-reliance on projections can lead to maladaptation or planning paralysis.
- Traditional & Indigenous Ecological Knowledge (TEK): Proven, cost-effective flood, water, and fire management systems (e.g. Australian Aboriginal cultural burnings, Andean terrace water harvesting) function entirely independent of GCMs.
🧠 Exam Technique: Structuring a 33-Mark Level 4 Essay
- Introduction: Define climate modelling (GCMs, predictive scenarios) and categorize human responses into mitigation and adaptation. Set up your central thesis (e.g. "Modelling is an indispensable precursor to global mitigation targets and strategic mega-projects, but is neither sufficient nor universally essential at local, reactive adaptation scales.").
- Body Paragraph Structure (PEEL with Criteria):
1. Modelling as essential for Macro-Mitigation & Global Diplomacy (IPCC, carbon budgets, Paris commitments).
2. Modelling as essential for Proactive Long-Term Capital Adaptation (TE2100, Dutch Room for the River, flood zoning).
3. Counter-Evaluation: Reactive Adaptation & Autonomous Responses (agricultural shifts, local responses to observed events).
4. Counter-Evaluation: Socio-Economic & Political Bottlenecks (Governance, finance gap, fossil fuel lobby outweighing data). - Evaluation Criteria to Weave Through: Evaluate across timescale (short-term reactive vs long-term proactive), spatial scale (global/national policy vs local farm-level), and economic development (high-income tech-heavy solutions vs lower-income resource limitations).
- Conclusion: Give an explicit, substantiated verdict answering "How essential?". Do not sit on the fence without reasons.
❌ Common Student Pitfalls & Examiner Warnings
- Describing Models Instead of Evaluating Necessity: Spending three pages explaining how greenhouse gases trap infrared radiation or how supercomputers calculate grid cells without linking back to human responses.
- Treating "Human Response" Only as Adaptation: Forgetting international mitigation treaties, renewable transitions, and carbon pricing, which rely entirely on modelled emissions pathways.
- One-Sided Arguments: Agreeing entirely that modelling is 100% essential and ignoring that millions of people adapt daily based on lived observation, indigenous knowledge, and necessity.
- Lacking Specific Real-World Evidence: Using vague generalisations ("countries build sea walls") instead of named schemes, locations, and frameworks (e.g. Thames Estuary 2100, Kiribati's Migration with Dignity, COP28 Loss & Damage fund).
- Tacked-On Conclusion: Writing a summary that merely repeats points rather than delivering a decisive, criteria-grounded judgment.
💡 Examiner-Grade Evaluative Synthesis (Model Conclusion)
"In conclusion, the assertion that climate modelling is essential holds true predominantly at the macroeconomic and geopolitical scale. For global mitigation targets and high-capital, multi-decadal adaptation schemes like the Thames Estuary 2100 or Dutch Delta Works, GCM-derived carbon budgets and sea-level projections are indispensable to prevent catastrophic under-engineering or wasteful misallocation of capital. However, climate modelling is not an omnipotent panacea. At local and micro-scales, effective adaptation is frequently autonomous and reactive, rooted in direct weather experience, indigenous stewardship, and agricultural pragmatism. Crucially, the definitive bottleneck in addressing anthropogenic climate change is no longer scientific ignorance or model inaccuracy, but geopolitical inertia, corporate lobbying, and global climate finance deficits. Thus, while climate modelling provides the non-negotiable blueprint for effective action, it is human political and economic willingness that ultimately determines whether the response is executed."
Level 4 Criteria Met: Nuanced, Multi-scalar, Definitively EvaluatedTopics
Topic 3.1 Climate Change · 4.a. An effective human response relies on knowing what the future will hold. · 4.c. Mitigation and adaptation are complementary strategies for reducing and managing the risks of climate change. · 5.a. Effective implementation depends on policies and co-operation at all scales.
Question and mark scheme from the OCR A-Level Geography examination, Geographical debates (03), June 2025. QuestionVault is an independent revision resource; questions remain the copyright of the awarding body.