2024 IB DP Geography 模擬試題連答案詳解

(a)(i) The dependency ratio is the mathematical relationship between the non-economically active population (dependents aged under 15 and over 64) and the economically active population (working-age group aged 15 to 64), expressed as a percentage: \(\text{Dependency Ratio} = \frac{\text{Population (0-14)} + \text{Population (65+)}}{\text{Population (15-64)}} \times 100\). (a)(ii) Country X is projected to experience a significant population aging and shrinking trend. The median age increases by 11 years (from 41 to 52 years), while the total population decreases by 21 million (from 126 million to 105 million). Concurrently, the dependency ratio rises sharply from 55% to 85% due to an aging demographic driven by a negative natural increase rate of -0.6%. (b) Economic challenge: A shrinking labor force reduces tax revenues (income tax) while demand for government spending on pensions and geriatric healthcare increases. This fiscal strain can lead to economic stagnation or increased national debt. Social challenge: The rising dependency ratio means fewer young adults are available to care for an increasingly frail elderly population, leading to caregiver burnout, social isolation for the elderly, and increased strain on social welfare services. (c) Governments can implement pro-natalist policies such as subsidizing childcare, offering parental leave benefits, and providing tax incentives for larger families to encourage higher birth rates. Alternatively, they can implement selective immigration policies to attract skilled young workers from abroad.

(a)(i) [2 marks] Award 1 mark for identifying the two population segments (dependents: 0-14 and 65+; and independent: 15-64). Award 1 mark for explaining it as a ratio, proportion, or mathematical formula. (a)(ii) [2 marks] Award 1 mark for identifying the overall trend (aging, shrinking, or increasing dependency). Award 1 mark for utilizing supporting data points from the text (e.g., median age increasing from 41 to 52, or population shrinking to 105 million). (b) [4 marks] Economic Challenge (2 marks): Award 1 mark for identifying a valid economic challenge (e.g., labor shortages, pension crisis, reduced tax base) and 1 mark for explaining its impact on Country X. Social Challenge (2 marks): Award 1 mark for identifying a valid social challenge (e.g., elder isolation, healthcare pressure, family care burdens) and 1 mark for explaining its impact. (c) [2 marks] Award 1 mark for proposing a viable policy (pro-natalist incentives, immigration, or raising the retirement age) and 1 mark for explaining how it directly addresses the decline in population size or labor force.

(a) There is a strong negative (inverse) relationship between GDP per capita and climate vulnerability. As wealth increases, vulnerability decreases. For example, Low-Income Country A has a very high CVI of 78, while High-Income Country C has a low CVI of 22. (b) Despite having a moderate GDP per capita of $12,000, Country D's high vulnerability (CVI = 85) is driven by physical and geographic exposures. As a Small Island Developing State (SIDS), it is highly exposed to sea-level rise, coastal erosion, and high-frequency tropical storms. Economically, SIDS often have narrow, resource-dependent economic bases (such as tourism or fisheries) which are highly sensitive to climate shocks, leaving them with limited domestic capacity to fund large-scale adaptation infrastructure. (c) Resilience refers to the capacity of a community, ecosystem, or society to resist, absorb, accommodate, adapt to, and recover from the hazardous effects of climate change in a timely and efficient manner, preserving its essential basic structures and functions. (d) Community-led actions, such as establishing localized mangrove restoration programs, build resilience by creating natural barriers against coastal storm surges. This reduces the physical impact of extreme weather events on homes and farmland, while simultaneously protecting local fisheries that support community livelihoods, thereby strengthening both physical and economic safety nets.

(a) [2 marks] Award 1 mark for identifying the negative/inverse relationship. Award 1 mark for using data from Countries A, B, or C to support this statement. (b) [3 marks] Award 1 mark for identifying physical geographic constraints (e.g., low-lying islands, extreme weather vulnerability). Award 1 mark for identifying economic/social factors (e.g., small scale, reliance on single industries like tourism). Award 1 mark for explaining how these combine to produce high vulnerability despite moderate economic wealth. (c) [2 marks] Award 2 marks for a complete definition addressing coping capacity, adaptation, and recovery. Award 1 mark for a partial definition (e.g., 'the ability to bounce back from climate disasters'). (d) [3 marks] Award 1 mark for identifying a specific community-led action (e.g., community rain-water harvesting, local crop diversification, mangrove planting). Award up to 2 marks for explaining how this action directly enhances local resilience (e.g., secures water supplies during drought, mitigates crop failure, stabilizes food security).

(a)(i) An ecological footprint is a measure of the area of biologically productive land and water (expressed in global hectares, gha) required to produce all the resources a population consumes and to absorb/assimilate the waste it generates, using prevailing technology. (a)(ii) Region X is experiencing an ecological deficit. The size of the deficit is 5.4 global hectares (gha) per person, calculated as: \(7.5 \text{ gha (footprint)} - 2.1 \text{ gha (biocapacity)} = 5.4 \text{ gha}\). (b) The water-food-energy nexus represents the deep interconnections between these three systems. When consumption of one resource increases, it places stress on the others. For example, expanding food production to meet growing demand requires massive amounts of water for irrigation and energy for processing/transport. If water resources are depleted, agricultural yields collapse and energy production (such as hydroelectricity or thermal power cooling) is disrupted, triggering cascading insecurity across all three sectors. (c) A circular economy aims to design out waste, keep products/materials in use, and regenerate natural systems. By implementing closed-loop recycling and repairing systems, a country reduces its demand for virgin raw materials (reducing the land footprint associated with mining and forestry) and drastically decreases carbon emissions from manufacturing, thereby lowering its overall ecological footprint.

(a)(i) [2 marks] Award 1 mark for referencing the area of land/water required to sustain a population. Award 1 mark for mentioning the absorption of waste/carbon dioxide or the use of global hectares (gha) as a unit. (a)(ii) [2 marks] Award 1 mark for correctly identifying Region X. Award 1 mark for the correct calculation: 5.4 gha per person (must state units or show correct math). (b) [3 marks] Award 1 mark for demonstrating understanding of the interconnected nature of the nexus. Award up to 2 marks for a logical explanation of a feedback loop/cascade (e.g., how increased energy use for water desalination or irrigation impacts fuel/food costs and availability). (c) [3 marks] Award 1 mark for defining or characterizing circular economy principles (e.g., recycling, waste reduction, reuse). Award up to 2 marks for explaining how these principles translate to a reduced ecological footprint (e.g., fewer raw materials extracted, lower carbon emissions, reduced landfill pressures).

### Part (a) Solution
Two environmental hazards shown or implied by the infographic:
1. **Toxic Leaching:** Heavy metals such as lead and mercury leach into local soils and contaminate freshwater aquifers/water tables.
2. **Air Pollution:** Open-air burning of electronic components (e.g., plastics, copper wiring) releases toxic dioxins and particulate matter into the atmosphere.

### Part (b) Solution
- There is a strong global disparity: high-income regions generate the highest amount of e-waste per capita (Northern Europe at 22 kg and Northern America at 21 kg) compared to lower-income regions (Sub-Saharan Africa at 2 kg and Southern Asia at 3 kg).
- Formal recycling rates do not match generation rates in absolute terms, but they are highest in Europe (45%) and lowest in Africa (1%).
- A critical geographical relationship is the transboundary flow: e-waste is generated in regions with high consumption (Americas, Europe) and exported to regions with extremely low formal recycling infrastructure (Africa, Southern Asia), where informal and hazardous processing dominates.

### Part (c) Solution
**Strengths of the infographic for circular economy planning:**
- **Identifies key hotspots:** Highlights where generation is highest (e.g., Europe, North America) and where capacity is lowest (Africa, Southern Asia), helping direct international funding and infrastructure support.
- **Highlights system leaks:** Quantifies that over 80% of waste escapes formal recycling, emphasizing the urgent need for global policy frameworks like Extended Producer Responsibility (EPR).
- **Visualizes global flows:** Shows that the problem is transnational, meaning solutions must involve international treaties (like the Basel Convention) rather than just national policies.

**Limitations of the infographic for circular economy planning:**
- **Lack of granular data:** Aggregates data at broad regional scales, masking significant national variations (e.g., differences between highly regulated and unregulated countries within Africa or Asia).
- **No insights into upstream solutions:** It focuses entirely on waste management (downstream) rather than upstream circular design solutions (e.g., modular design, right to repair, reducing material inputs).
- **Underrepresents informal economy value:** While hazardous, the informal sector recovers valuable secondary raw materials; the infographic categorizes this only as a hazard rather than a potential system to upgrade and formalize.

### Part (a) [2 Marks]
- Award **1 mark** for each valid environmental hazard identified up to a maximum of **2 marks**.
- *Expected answers:* Heavy metal leaching (lead, mercury) polluting water tables/soils; toxic air emissions from burning wire insulation; degradation of local ecosystems.
- *Note:* Do not accept human health hazards (e.g., respiratory disease) unless explicitly linked to an environmental pathway (e.g., biomagnification in food chains).

### Part (b) [3 Marks]
- Award **1 mark** for describing the pattern of high-generation/high-income vs. low-generation/low-income.
- Award **1 mark** for referencing specific data/percentages/weights from the infographic.
- Award **1 mark** for identifying the transboundary spatial mismatch (export from high-income to low-income regions with minimal formal recycling).

### Part (c) [5 Marks]
- **4–5 marks:** A balanced evaluation that discusses both strengths (e.g., identifying flows, highlighting scale of informal sector) and limitations (e.g., lack of sub-regional nuance, focus on downstream waste rather than upstream product life cycles/repairability) with clear geographic terminology and a concluding judgment.
- **2–3 marks:** A descriptive response that identifies some strengths and/or limitations but lacks depth, balance, or a clear evaluation of its utility for circular economy planning.
- **1 mark:** A basic comment identifying one strength or limitation without development.

Introduction: - Define the circular economy as a regenerative system where resource input, waste, emission, and energy leakage are minimized by slowing, closing, and narrowing energy and material loops. - Define resource insecurity as the lack of reliable access to sufficient, safe, and nutritious food, clean water, and clean energy. - Thesis statement: While circular principles provide a vital framework for reducing raw material demand and decoupling economic growth from environmental degradation, technological, financial, and political obstacles mean it is a partial solution that must be accompanied by absolute consumption reduction. Body Paragraph 1 (Opportunities & Solutions): - Reduced pressure on primary raw materials through recycling and industrial symbiosis. Example: Kalundborg Symbiosis in Denmark, where steam, gas, water, and gypsum are shared between a refinery, power plant, and other industries, significantly reducing water and energy consumption. - Recovery of valuable materials from waste streams, such as urban mining for rare earth metals in discarded electronics, which reduces geopolitical reliance on key mining countries. Body Paragraph 2 (The Water-Food-Energy Nexus): - Circular strategies can resolve competing demands in the Nexus. Example: Singapore uses a circular closed-loop water system (NEWater) to treat wastewater for industrial and drinking use, reducing its water vulnerability. - Organic waste-to-energy systems (anaerobic digestion) can simultaneously reduce municipal food waste, generate renewable energy, and produce bio-fertilizers for agricultural food security. Body Paragraph 3 (Challenges & Limitations): - High capital costs: Transitioning to circular infrastructure is financially prohibitive for many Low- and Middle-Income Countries (LICs and MICs), which are often the most resource-insecure. - Technological limits: Not all materials are infinitely recyclable (e.g., plastics degrade in quality, and complex composite materials are difficult to separate). - Jevons' Paradox: Increased circular efficiency could lower production costs, leading to increased overall consumption of cheaper circular goods, thereby neutralizing resource savings. Conclusion: - Summarize that the circular economy is an essential tool to address global resource insecurity, particularly in resource-intensive High-Income Countries (HICs). However, it is not a complete panacea; global resource security also requires systemic changes to reduce absolute consumer demand and international funding to help developing nations build circular infrastructure.

Level 1 (1-3 marks): Descriptive outline of circular economy concepts or resource security with minimal detail. Lacks structured evaluation and has no relevant geographical examples. Level 2 (4-6 marks): Understands the difference between linear and circular models. Describes some benefits or challenges related to resource security. Uses generic or poorly developed examples. Evaluation is present but weak, superficial, or one-sided. Level 3 (7-8 marks): Explains how circular economy strategies address resource insecurity, explicitly referencing food, water, or energy systems. Uses specific, relevant geographical examples (e.g., country or industry scale). Provides a structured, balanced evaluation of both opportunities and structural/economic limitations. Level 4 (9-10 marks): Demonstrates a sophisticated, nuanced understanding of the complexities of the transition (e.g., financial inequalities, physical limits of recycling, or nexus connections). Evaluates 'to what extent' with a clear, well-supported judgment, logical structure, and sophisticated synthesis.