Global population futures — AQA A-Level Geography
Test yourself on Global population futures with AQA A-Level practice questions.
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Global population futures explained
Global environmental change significantly impacts human health.
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Stratospheric ozone depletion increases surface exposure to harmful ultraviolet radiation, directly elevating the incidence of skin cancer and cataracts, which impair vision. Concurrently, climate change introduces severe health risks. Rising global temperatures cause direct thermal stress, increasing mortality during heatwaves. Furthermore, shifting climate zones alter the geographical distribution of vector-borne diseases, such as malaria and dengue fever, exposing new populations. Climate change also disrupts agricultural productivity through extreme weather and shifting rainfall, threatening global nutritional standards and increasing malnutrition risks.
Prospects for the global population. Projected distributions. Critical appraisal of future population-environment relationships.
Global population prospects suggest a peak of around 10.4 billion by the 2080s, though UN projections vary based on fertility rate assumptions. Projected distributions show stark regional contrasts: sub-Saharan Africa will experience rapid growth, while Europe and East Asia face population decline and ageing. A critical appraisal of future population-environment relationships requires evaluating competing theories. Neo-Malthusian perspectives argue that unchecked growth will exceed Earth's carrying capacity, leading to resource depletion and environmental degradation, exacerbated by climate change. Conversely, Boserupian views suggest human innovation, such as genetically modified crops or renewable energy, will overcome environmental limits, allowing sustainable coexistence.
Your focus
- Explain the biological mechanisms by which ozone depletion leads to increased rates of skin cancer and cataracts.
- Analyse the direct and indirect health consequences of climate change, including thermal stress and shifting vector-borne disease patterns.
- Evaluate the threat of climate change to global agricultural productivity and its subsequent impact on nutritional standards.
Show all 6 objectives
- Interpret different UN global population projections and explain the variables that cause them to differ.
- Map and describe the projected future distribution of the global population by region.
- Evaluate competing theories on how future population changes will impact and interact with the natural environment.
Global population futures exam tips
Marking Points
- Explain the link between stratospheric ozone depletion, increased UV radiation, and the rising rates of skin cancer and cataracts.
- Analyse how climate change exacerbates thermal stress, leading to increased cardiovascular and respiratory mortality during extreme heat events.
- Describe how changing temperature and precipitation patterns expand the spatial distribution and seasonality of vector-borne diseases like malaria.
- Evaluate the indirect health impacts of climate change via reduced agricultural yields, leading to compromised nutritional standards and food insecurity.
- Identify and explain UN population projections (high, medium, and low variants) and the factors influencing these trajectories.
- Describe the projected spatial distribution of future populations, highlighting the shift in demographic weight towards Africa and Asia.
- Critically evaluate neo-Malthusian theories regarding carrying capacity, resource scarcity, and ecological overshoot in the context of future growth.
- Assess Boserupian and cornucopian perspectives that emphasise technological innovation and adaptation in mitigating environmental limits.
- Analyse the complex feedback loops between population growth, climate change, and environmental degradation.
Examiner Tips
- 💡Clearly distinguish between the health impacts of ozone depletion (UV-related) and climate change (temperature and weather-related) to avoid conflating the two environmental issues.
- 💡Use specific examples of vector-borne diseases, such as the spread of the Anopheles mosquito or Zika virus, to illustrate changing disease distributions.
- 💡Link agricultural productivity directly to human health by discussing specific nutritional deficiencies that arise when staple crop yields fail.
- 💡Use specific UN projection data (e.g., 10.4 billion peak) to support arguments about future global population prospects.
- 💡When critically appraising population-environment relationships, explicitly contrast pessimistic (Malthusian) and optimistic (Boserupian) viewpoints.
- 💡Link projected demographic distributions to specific environmental pressures, such as water scarcity in rapidly growing sub-Saharan regions.
Common Mistakes
- Confusing ozone depletion with the enhanced greenhouse effect; ozone depletion causes increased UV exposure leading to skin cancer, not global warming.
- Assuming vector-borne diseases only affect tropical regions; climate change is allowing vectors like mosquitoes to survive at higher latitudes and altitudes.
- Overlooking the indirect health impacts of climate change; students often focus solely on direct impacts like thermal stress while ignoring malnutrition caused by declining agricultural productivity.
- Assuming global population will grow indefinitely; correction: acknowledge that growth rates are slowing and population is projected to peak before 2100.
- Treating population growth as uniform globally; correction: specify regional variations, noting rapid growth in Africa versus decline in parts of Europe and Asia.
- Presenting Malthusian theory as an absolute fact; correction: critically appraise it by contrasting it with Boserupian innovation and acknowledging technological advancements.