IB Geography 3.2.1 the Water-food-energy Nexus Notes

An Intervention in One System Shows up as a Cost in the Other Two

1. The water, food and energy nexus is the interdependence of three resource systems, in which a deliberate intervention in one propagates into the other two.
2. Holger Hoff's paper for the Bonn 2011 Nexus Conference defines a nexus approach as cross-sector decision-making that reduces trade-offs and builds synergies.
3. The analytical word there is trade-off, because saying that three systems are linked reports an observation while a trade-off identifies who pays for the gain.
4. Hoff's own illustration is irrigation, which raises output per hectare though it generally raises the energy intensity of that output compared with rainfed farming.

Water as the Input to Energy and to Food

1. Water for energy
   1. Thermal power stations burning coal or gas, and nuclear stations alike, need water to condense steam once it has passed through the turbine.
   2. The IEA put the energy sector's freshwater withdrawals at about 370 billion cubic metres in 2021, roughly 10 percent of the world total.
2. Water for food
   1. Agriculture takes 71 percent of global freshwater withdrawals on the AQUASTAT 2025 update for 2022, and irrigation is the great majority of that claim.

Energy and Food as Inputs to Each Other

1. Energy for water
   1. Pumping, conveyance and treatment all run on electricity, with seawater reverse osmosis alone using 9 to 22 megajoules per cubic metre, about 2.5 to 6 kilowatt hours, on the IEA's 2026 assessment of desalination.
2. Energy for food
   1. Synthetic nitrogen fertiliser begins as ammonia, whose production the IEA's Ammonia Technology Roadmap, published in 2021, put at around 2 percent of world total final energy consumption, some 8.6 exajoules.
   2. More than 70 percent of that ammonia comes from steam reforming of natural gas, which ties the price of fertiliser to the price of gas.
3. Food for energy
   1. USDA's Feed Outlook of 14 May 2026 put 5.6 billion bushels of United States maize into ethanol in 2025/26, against a record 6.2 billion bushels of feed and residual use.

Water Security Is Defined by UN-Water as a Capacity, and Volume Is Only Part of It

The capacity of a population to safeguard sustainable access to adequate quantities of and acceptable quality water for sustaining livelihoods, human well-being, and socio-economic development, for ensuring protection against water-borne pollution and water-related disasters, and for preserving ecosystems in a climate of peace and political stability.

1. Quantity and quality together
   1. Enough water of an acceptable standard has to reach livelihoods, households and the economy, so a contaminated abundance fails the test.
2. Protection and ecosystems
   1. The definition covers water-borne pollution, water-related disasters and the water left in rivers and wetlands, which brings flooding, sanitation and environmental flow inside water security rather than beside it.
3. Peace and political stability
   1. The closing clause makes governance part of the definition, so a shared basin under dispute is less secure at the same volume.

Food Security Has Four Dimensions in FAO's Framing, Only One of Which Is Supply

Food security exists when all people, at all times, have physical and economic access to sufficient, safe and nutritious food that meets their dietary needs and food preferences for an active and healthy life.

1. Availability
   1. Food of appropriate quality is physically present, whether from domestic production or from imports including food aid.
2. Access
   1. Households command the resources to obtain that food, through income, entitlements and the legal, political and social arrangements of their community.
3. Utilization
   1. The body converts food into nutritional well-being, which needs clean water, sanitation and health care alongside an adequate diet.
4. Stability
   1. Access holds through time rather than collapsing under a price shock, a harvest failure or a seasonal gap.

Energy Security Carries a Short-Term and a Long-Term Sense in the IEA's Definition

1. The IEA defines energy security as the uninterrupted availability of energy sources at an affordable price, which puts affordability inside the definition rather than beside it.
2. Short-term energy security
   1. The IEA describes this as the ability of the energy system to react promptly to sudden changes within the supply and demand balance, which a cold snap or a ruptured pipeline tests within hours.
3. Long-term energy security
   1. The IEA describes this as timely investments to supply energy in line with economic developments and environmental needs, so a terminal or a reactor decides the question a decade before any shortage appears.

An Energy Pathway Is the Physical Route a Fuel Takes, and Each Route Fixes a Relationship

1. An energy pathway is the route by which an energy source travels from producer to consumer, whether by pipeline, tanker, cable or rail.
2. Because the route is fixed, the countries at its two ends gain power over each other; this is the geopolitics of energy pathways.

Pipelines Commit a Buyer and a Seller to Each Other for Decades

1. Explosions on 26 September 2022 ruptured three of the four Nord Stream lines built to carry Russian gas under the Baltic Sea to Germany, one of which had never entered commercial service.
2. The contract carrying Russian gas across Ukraine expired on 1 January 2025, closing a route that Bruegel records as moving 140 terawatt hours of gas in 2023.
3. Bruegel put that route at 65 percent of the combined gas demand of Austria, Hungary and Slovakia in 2023, which turned its closure into a national question rather than a commercial one.
4. TurkStream, crossing the Black Sea to Turkey and continuing to Bulgaria, Serbia and Hungary, is now the only Russian pipeline still delivering gas into the European Union.
5. Russia's eastern pathway runs the other way, with deliveries through the Power of Siberia line to China set to rise from 38 to 44 billion cubic metres a year.
6. A binding memorandum signed on 2 September 2025 set a target of 50 billion cubic metres a year for a second line through Mongolia, though a memorandum is an intention rather than a pipe.

Liquefied Natural Gas Turns a Fixed Pipe Into a Cargo That Can Change Destination

1. The International Gas Union's World LNG Report 2026 put global trade at a record 437 million tonnes in 2025, 6.3 percent above 2024.
2. In 2025, the United States supplied 26 percent of global LNG exports, while the United States, Qatar and Australia together supplied 63 percent.
3. Asia imported 35.7 billion cubic feet a day in 2025, 4 percent below 2024, while European imports rose 29 percent after Russian gas transit through Ukraine stopped.
4. Egyptian officials priced piped Israeli gas at about US$7.70 per million British thermal units, compared with US$12 to US$14 for delivered LNG.

Chokepoints Concentrate the Sea Pathways Into a Few Kilometres of Water

1. The EIA's World Oil Transit Chokepoints assessment, updated on 3 March 2026, measures how much seaborne trade passes each narrow point.
2. In the first half of 2025 the Strait of Hormuz carried 20.9 million barrels a day of oil, about 20 percent of world petroleum liquids consumption, along with over 20 percent of world LNG trade.
3. In early 2025, the Strait of Malacca carried 23.2 million barrels a day, or 29 percent of maritime oil flows, while the Suez route carried 4.9 million and Bab el-Mandeb 4.2 million.
4. The Panama Canal Authority cut daily transits from 34 to 36 down to 24 on 7 November 2023 after October rainfall fell 41 percent below the previous record low.
   1. The same advisory stepped the booking slots down again to 22 in December and 20 in January, so the drought narrowed the pathway for months rather than days.
5. That is the nexus operating on a pathway, because the water level in one lake set how many cargoes could cross a continent.

Interconnectors Are the Electricity Version of a Pipeline

1. A transmission interconnector is a high voltage link letting one control area import or export power, which turns neighbouring grids into a shared pool of reserve.
2. Estonia, Latvia and Lithuania left the Russian-controlled BRELL ring on 8 February 2025 and joined Continental Europe's grid through Poland the next day.
   1. The submarine cables to the Nordic system carry direct current, so they move power without carrying frequency and could not have done the synchronizing.
3. ENTSO-E records that at 12:33 CEST on 28 April 2025 the power systems of continental Spain and Portugal suffered a total blackout, the most severe such incident on the European system in over 20 years.
4. An area with few interconnectors has less external reserve to draw on when generation trips, which is why interconnector capacity is counted as a security asset rather than only a trading route.

Infrastructure, Income and Governance Turn an Endowment into Security

1. Resource security cannot be read off a physical endowment, because the endowment sets a ceiling rather than an outcome.
2. Infrastructure
   1. Storage, pipes, grids, ports and treatment works are what convert a resource in the ground or the river into one delivered at a tap or a socket.
3. Income
   1. A country that can pay can import the shortfall, which is why the World Bank classing Canada as high income and Egypt as lower-middle income for its 2027 fiscal year bears directly on their resource positions.
4. Governance
   1. Allocation rules, tariffs, subsidies and treaties decide who receives the resource when there is not enough for everyone.

Canada and Egypt: Contrasting Resource Security Across the Nexus

Canada: A Large Endowment Delivered by Pipelines, Grids and Income

1. Statistics Canada's water yield accounting gives an average annual yield of 3,478 cubic kilometres for 1971 to 2013, the third largest renewable freshwater supply of any country.
2. That water sits in the wrong place for the people, with the Pacific coastal drainage region yielding about 339,000 cubic metres per person against 5,689 in the Prairie regions.
3. Hydropower supplied 343.5 million megawatt hours of Canada's 622.2 million megawatt hours of electricity in 2024, 55.2 percent of generation, on Statistics Canada's preliminary release of 22 October 2025.
4. That is a generation figure rather than a capacity figure, so it already reflects how much water ran through the turbines that year.
5. Canada exported 4.3 million barrels a day of crude oil in 2025, of which the United States took 3.9 million or 90.1 percent, on the Canada Energy Regulator's trade summary of 27 May 2026.
6. Canada's agriculture and agri-food exports reached C$100.3 billion in 2024, yet 24.0 percent of Canadians lived in food-insecure households in 2025.
7. The rate reached 56.4 percent in Nunavut, where the binding constraints are distance, income and freight cost rather than national supply.

Egypt: One River Carrying a Water Balance That Does Not Close

1. Egypt's Minister of Water Resources and Irrigation, Hani Sewilam, told Ahram Online in April 2026 that the per capita water share stands at about 500 cubic metres a year, down from 2,000 in 1962.
2. The ministry's own balance sets annual demand at 88.55 billion cubic metres against renewable resources of 65.35 billion, closing the 23.2 billion cubic metre gap by reuse.
3. Closing a water gap by reuse is a nexus decision, because treatment and pumping convert a water shortage into an electricity demand.
4. USDA figures put Egypt's wheat imports at 13.0 million tonnes in marketing year 2025/26, against domestic production of 9.3 million and consumption of 20.4 million.

Egypt: A Gas Balance That Reversed and a Dam Built Upstream

1. Natural gas generated 174.9 of Egypt's 215.8 terawatt hours of electricity in 2022, 81 percent, on the EIA's country analysis of 13 August 2024, which makes the power supply and the gas balance one problem.
2. Zohr field output fell from about 2.7 billion cubic feet a day in 2019 to 1.9 billion by mid-2024, while Egyptian gas consumption exceeded production in 2023.
3. Egypt imported a record 9.01 million tonnes of LNG in 2025, more than triple its 2024 total; the United States supplied 90.9 percent.
4. Upstream, Ethiopia inaugurated the Grand Ethiopian Renaissance Dam on 9 September 2025, with 5,150 megawatts of installed capacity and an expected 15,700 gigawatt hours a year behind a 74 billion cubic metre reservoir.
5. Those two figures measure different things, since the megawatts rate the turbines while the gigawatt hours describe the output a normal year of river flow allows.
6. Egypt objected to the filling and operation of that reservoir, because Ethiopian energy security here is produced by storing water that Egyptian water security depends on receiving.

Reading the Pair Against the Three Securities

1. On water, Canada's constraint is distribution inside a huge endowment while Egypt's is the absolute size of the flow it receives.
2. On food, Canada's constraint is access within a wealthy exporter while Egypt's is stability inside a large import dependence.
3. On energy, Canada's position rests on production and a single export customer while Egypt's rests on a domestic gas balance that reversed.
4. Income and governance separate the two as much as geography does, because a high-income country can buy past a shortfall that a lower-middle-income one has to ration.

Use Canada and Egypt to Compare Three Security Dimensions

1. Each half of a [2+2] explanation pair is short enough that one nexus mechanism with one figure attached fills it.
2. A Section C answer on resource security is stronger with both countries, because the contrast supplies evidence a single country cannot, though no mark scheme names a required number of places.
3. Give the source and the year with each figure, since an undated number cannot be checked against anything.