Environmental systems, resource use and evidence-based evaluation
Physical geography: processes, budgets and risk
Shared geographical foundations
This chapter reviews shared geographical concepts and interpretation of supplied evidence. It does not establish the syllabus, administrative rules, current policy, language or difficulty of a particular examination.
Core rules and concepts
- Relief as a system: endogenic structure (uplift, subsidence, salt tectonics in the North German Basin) sets the frame; exogenic processes (glacial and periglacial sculpture, fluvial erosion, marine abrasion, aeolian transport) shape it. The North German Plain is a young glacial landscape: ground and end moraines, outwash plains (Sander), glacial valleys (Urstromtäler), and Geschiebemergel till control drainage and soil texture.
- Water balance: P = ET + R + ΔS (precipitation = evapotranspiration + runoff + storage change). Actual evapotranspiration is limited by available water; potential evapotranspiration describes demand under reference conditions and depends on radiation and atmospheric factors. A positive climatic water balance means P > PET; a negative one means a deficit that must be met from soil storage or irrigation. Sandy outwash soils have low field capacity, so deficits hit faster even where annual P is adequate.
- Soil formation factors (Jenny): climate, organisms, relief, parent material, time; plus human influence. Acidic organic inputs, leaching and suitable parent material can support podzolisation. Sandy substrates and calcareous till can produce different soil developments, but parent material alone does not uniquely determine a soil class. Gley and pseudogley record waterlogging versus perched water.
- Hazards as risk: Risk depends on hazard, exposure and vulnerability; a product is a conceptual model unless a specific quantitative convention is supplied. Physical probability alone is not an answer; you must name who or what is exposed and why vulnerability differs (building standards, warning systems, land use on floodplains).
Worked example with reasoning
Task: explain why a low-lying North Sea coastal area with rising sea level needs more than higher dikes. Reasoning chain: (1) a supplied sea-level-rise scenario changes the water-level baseline, while any change in storm statistics needs separate evidence; (2) subsidence from peat oxidation and groundwater withdrawal raises relative sea level; (3) higher external water levels can restrict gravity drainage, so taller dikes alone do not solve drainage and pumping needs; (4) therefore adaptation combines dike reinforcement, retention areas (Polder), managed realignment (de-poldering to rebuild marsh as wave attenuation), and land-use restriction in the most exposed zones. Conclusion ties risk components together rather than claiming "dikes are the solution".
Traps that cost marks
- Naming processes without the controlling variables (grain size, slope, vegetation cover, permafrost).
- Using potential evapotranspiration as if it were real water loss.
- Describing soils by colour instead of by diagnostic processes.
- Confusing hazard magnitude with disaster impact.
- Ignoring timescales: a glacial landform and a storm surge operate on completely different clocks.
Sustainability, resources and environmental evaluation
Shared geographical foundations
This chapter reviews shared geographical concepts and interpretation of supplied evidence. It does not establish the syllabus, administrative rules, current policy, language or difficulty of a particular examination.
Core rules and concepts
- Sustainability concept: the Brundtland definition (meeting present needs without compromising future generations) and the three-pillar model (ecology, economy, social). The stronger concept is strong sustainability (natural capital cannot be substituted indefinitely) versus weak sustainability (substitution allowed). The UN Sustainable Development Goals provide a broad policy framework, not a guarantee that a specific project is sustainable.
- Resource types: renewable versus non-renewable; stock versus flow resources; the distinction between reserves (economically extractable) and resources (total). The sustainability rule for renewables is harvest ≤ regeneration rate; for non-renewables, some economic models examine reinvestment of resource rents under explicit substitution assumptions; this is not a universally sufficient sustainability rule.
- Material and energy flows: throughput analysis traces resource inputs, useful services and wastes. IPAT organizes population, affluence and technology factors only after impact and units are defined; it is not an independent causal law. Energy-system evaluation considers generation variability, transmission, storage, efficiency and demand flexibility. Current subsidy rules and national expansion targets are not supplied here.
- Environmental change: nutrient inputs can contribute to eutrophication, while land use and climate influence exposure to flooding or water stress. Identifying a pressure is not the same as showing its share in a particular event. Policy effectiveness requires dated local evidence rather than assuming that a named regulation resolves every source.
- Instruments: command-and-control regulation, market instruments (emissions trading, carbon pricing), voluntary certification, and spatial planning restrictions. Evaluate by effectiveness, efficiency, equity and political feasibility.
Worked example with reasoning
Task: evaluate whether expanding offshore wind is sufficient for German climate targets. Reasoning: offshore wind adds low-carbon generation at high capacity factors, but availability is intermittent and located far from southern demand; grid expansion and storage are binding constraints; sector coupling (electric vehicles, heat pumps, industry) raises electricity demand; material inputs and marine ecological impacts must be counted. So the answer: offshore wind alone is not automatically sufficient; a robust chain includes grids, storage, efficiency, demand flexibility and hydrogen imports. Judge against criteria and state trade-offs.
Traps that cost marks
- Using "sustainable" without specifying which pillar or which substitution assumption.
- Confusing reserves with resources.
- Presenting the IPAT equation as an accounting identity that determines outcomes.
- Describing environmental regulation without naming the instrument type and the criterion.
- Omitting the environmental or social cost of a technology when calling it "green".