Investigate global resource use and the circular economy: finite resources, planetary boundaries, the linear-to-circular transition, and the interconnection of food, water and energy security

Note: This page is part of the HSC Geography 11-12 (2022) syllabus content, first examined in HSC 2025. The legacy 2009 syllabus content is preserved as reference for older revision material in the sibling module folders.

What this dot point is asking

The Global sustainability focus area asks you to investigate how human use of finite resources is approaching ecological limits, and how the circular economy reframes consumption and production. You need to be able to describe the linear vs circular model, apply the planetary boundaries framework, and explain how food, water and energy security interconnect. Use the geographical concepts of interconnection, sustainability and scale, and apply data analysis and spatial reasoning.

The answer

The dominant model of industrial production is linear: extract, manufacture, consume, dispose. A circular economy redesigns this loop so materials and products stay in use longer through reuse, repair, refurbishment, remanufacturing and recycling, with waste minimised at design.

Finite resources

• Fossil fuels (oil, gas, coal) are non-renewable on human timescales. Known reserves are large but extraction has rising environmental and climate costs.
• Critical minerals (lithium, cobalt, nickel, rare earths, copper) are essential for batteries, renewable energy, and electronics. Demand is rising rapidly with the energy transition. Many are concentrated geographically (cobalt in the Democratic Republic of Congo, rare earths in China, lithium in the Lithium Triangle of Chile, Bolivia and Argentina, and Australia is a major lithium producer).
• Freshwater is renewable but unevenly distributed. Groundwater aquifers (the Ogallala in the United States, the North China Plain) are being depleted faster than recharge.
• Phosphate rock is essential for fertiliser production and concentrated in a small number of countries (Morocco holds the largest share of known reserves).
• Biotic resources (fish stocks, forests, soil) are renewable in principle but can be exploited beyond regeneration.

Planetary boundaries

The planetary boundaries framework (Stockholm Resilience Centre, originally proposed by Rockstrom and colleagues, 2009; updated subsequently) identifies a set of Earth-system processes within which humanity can operate safely. The framework identifies nine boundaries including climate change, biosphere integrity, biogeochemical flows (nitrogen and phosphorus), land-system change, freshwater use, ocean acidification, stratospheric ozone, atmospheric aerosols, and novel entities (chemical pollution and plastics). Several boundaries are assessed by Stockholm Resilience Centre as transgressed.

The framework is a powerful geographical tool: it operates at the planetary scale, shows interconnection between Earth-system processes, and frames sustainability as staying within safe operating limits.

Food, water and energy security

These three are deeply interconnected (the food-water-energy nexus):

• Agriculture uses approximately 70 percent of global freshwater withdrawals.
• Food production is energy-intensive (fertiliser, machinery, transport, refrigeration). A large share of global emissions comes from food systems.
• Energy production can be water-intensive (thermal power plant cooling, hydropower, biofuels).

A stress on one element propagates to the others. Climate change amplifies stresses through drought, heatwaves and shifting growing zones.

The linear-to-circular transition

A circular economy operates on three principles (as articulated by the Ellen MacArthur Foundation): design out waste and pollution, keep products and materials in use, and regenerate natural systems.

Mechanisms include:

• Product design for durability, repair and disassembly.
• Extended producer responsibility schemes (producers responsible for end-of-life).
• Recycling infrastructure at the municipal and national scale.
• Reuse and sharing economies (libraries of things, repair cafes, second-hand markets).
• Industrial symbiosis (one industry's waste is another's input).
• Regenerative agriculture and ecosystem restoration.

Limits and critiques

A circular economy is not a free fix. Recycling has energy costs and quality losses for some materials (plastics in particular). Some products, like fossil fuels burned for energy, are inherently linear. Critical-mineral demand for the energy transition will require new extraction even with strong recycling, particularly in the near term.

Examples in context

Example 1. The European Union Circular Economy Action Plan. Adopted as part of the European Green Deal, the Circular Economy Action Plan sets out measures covering product design, sustainable consumption, waste prevention and sector-specific value chains (electronics, batteries, packaging, plastics, textiles, construction and food). It includes the Ecodesign for Sustainable Products Regulation, the Right to Repair directive, and the Critical Raw Materials Act. A strong response uses the EU to illustrate: how a large economic bloc can use regulation to drive design changes globally (since many manufacturers sell into the EU market); and how circular-economy policy intersects with industrial policy and climate policy.

Example 2. Australia's lithium and critical-minerals position. Australia is one of the world's largest producers of mined lithium (much of it from spodumene rock in Western Australia, with the Greenbushes mine among the largest globally). Most Australian lithium is exported as concentrate for processing overseas, primarily in China. The Australian Government has identified critical-minerals processing as a strategic priority through its Critical Minerals Strategy, aiming to move beyond extraction into refining and battery-grade chemical production. A strong response uses this to illustrate: how the energy transition reshapes resource geography; the difference between extraction (lower value-add) and processing (higher value-add); and the interconnection between Australia's resource exports and global circular-economy and decarbonisation strategies.

Try this

Q1. Distinguish between a linear and a circular economy, with reference to one named example. [4 marks]

• Cue. Linear: extract, make, use, dispose; example, single-use plastic bottle to landfill. Circular: design, use, reuse / repair / refurbish, recycle, regenerate; example, deposit-return scheme or refillable container system.

Q2. Explain the interconnection between food, water and energy security in the context of global sustainability. [6 marks]

• Cue. Agriculture uses approximately 70 percent of freshwater. Food production is energy-intensive (fertiliser, transport). Energy production is water-intensive (cooling, hydropower). Climate change amplifies stresses across all three. Use a specific region (Murray-Darling Basin, North China Plain, Sahel).

Q3. Evaluate the contribution of a named circular-economy policy or initiative to global sustainability. [8 marks]

• Cue. Pick Australia's Recycling and Waste Reduction Act 2020, the EU Circular Economy Action Plan, or a corporate take-back scheme. Strengths: reduced waste exports, design incentives, jobs in recycling sector. Limits: doesn't address overconsumption, recycling has quality losses, partial coverage. Use scale and sustainability as geographical concepts.