Key Idea: Topic 3.2 is about how our changing consumption of water, food and energy strains supply — and how the three are locked together. It pulls together three ideas: 3.2.1 — food security & its threats: when everyone has reliable access to enough safe food, and what lowers it (drought, conflict, poverty, rapid population growth) — plus how richer diets shift demand to meat and pile pressure on land. 3.2.2 — water & energy security: having a reliable, affordable supply of safe water and of uninterrupted energy, and the environmental (drought, pollution) and geopolitical (conflict, pipeline disputes, import dependence) threats to each. 3.2.3 — the water–food–energy nexus: the three resources are interdependent, so securing one forces trade-offs with the others — and population growth, richer diets and climate change squeeze the whole system. This is core content, examined on Paper 2 — a data-response read off a map, table or chart, a short structured Explain/Suggest, and a markband 'to what extent' essay.
🍞 3.2.1 — Food security and its threats
A place has food security when all its people, at all times, have reliable access to enough safe, nutritious food. It is not only about growing enough — people must also be able to reach the food and afford it. The skill examiners test is reading a food-security map or table (where the worst zones are in emergency), describing the pattern, then explaining the factors that lower food security.
Tip: For a food-security map or table, describe the pattern first — name where the emergency zones are (e.g. peripheral lowlands), quote a figure with units, and note any clustering. Then explain it with two distinct factors that lower food security.
💧 3.2.2 — Water & energy security
Resource security means a reliable, affordable supply that meets a country's needs. Water security is enough safe water; energy security is an uninterrupted, affordable energy supply. The two are linked — making energy uses water, and supplying clean water uses energy. Examiners test named-country Explains and a data-response (e.g. reading sunshine hours off a graph to judge a solar site).
A favourite Explain asks for one environmental and one geopolitical threat to energy security. Environmental = drought drying reservoirs → less hydropower. Geopolitical = a conflict closing a gas pipeline → imports cut. Keep the two types clearly separate.
🔗 3.2.3 — The water–food–energy nexus
Water, food and energy are not separate problems — they form a linked system, the nexus. You cannot secure one without affecting the others, so every choice involves a trade-off.
A growing population and richer diets demand more of all three resources at once, while climate change shifts rainfall and raises temperatures — so the nexus is stretched harder every decade and the trade-offs get sharper.
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Exam Tips
- On a food-security/resource map or table: DESCRIBE first (where the zones are, a figure with units, any clustering), THEN explain with distinct factors.
- Explain/Suggest = give the MECHANISM (drought → failed harvests → less food), never just name the factor.
- Two factors must be DISTINCT — not two versions of one (e.g. drought and poverty, not 'drought' and 'less rain').
- Keep environmental vs geopolitical threats separate: drought/heat/pollution = environmental; conflict/sanctions/pipeline = geopolitical.
- For an interaction question, show the LINK between two resources (water→food, energy→water), not just two resource names — agriculture uses ~70% of freshwater.
- On the [10] 'to what extent' essay, argue BOTH sides with named cases (Nile, Cape Town, California, Punjab) and finish with an explicit judgement.