Resource Futures and Sustainability
This lesson examines how humanity can manage resources sustainably for the future. You will study the ecological footprint, planetary boundaries, the circular economy, and different conceptions of sustainability. This content is essential for AQA A-Level Geography Paper 2 and connects to broader themes of global governance.
The Ecological Footprint
The ecological footprint measures the amount of biologically productive land and sea area required to produce the resources a population consumes and to absorb its waste, using prevailing technology.
Key Concepts
- Measured in global hectares (gha) per person
- Includes cropland, grazing land, forest (for timber and carbon absorption), fishing grounds, and built-up land
- Can be calculated for individuals, cities, countries, or the entire world
Global Data
| Country/Region | Ecological Footprint (gha per person) | Biocapacity (gha per person) |
|---|
| USA | 8.1 | 3.5 |
| UK | 4.2 | 1.1 |
| China | 3.7 | 0.9 |
| India | 1.2 | 0.4 |
| World average | 2.8 | 1.6 |
| Niger | 1.0 | 1.4 |
What the Data Shows
- If everyone lived like the average American, 5.1 Earths would be needed
- If everyone lived like the average Briton, approximately 2.6 Earths would be needed
- Humanity as a whole is currently using approximately 1.75 Earths worth of resources
- This means we are in ecological overshoot — consuming resources faster than they can be regenerated
Biocapacity
Biocapacity is the capacity of ecosystems to produce useful biological materials and to absorb waste generated by humans.
Factors Affecting Biocapacity
- Land area: larger countries generally have more biocapacity
- Productivity: temperate and tropical regions are generally more productive than arid or polar regions
- Technology and management: sustainable farming and forestry can increase biocapacity
- Degradation: soil erosion, deforestation, and pollution reduce biocapacity
Countries with High Biocapacity
- Brazil: vast forests, farmland, and freshwater resources
- Canada: large land area with extensive forests
- Australia: large but much land is arid, limiting biocapacity per hectare
Ecological Deficit and Reserve
- Ecological deficit: footprint exceeds biocapacity (consuming more than can be regenerated) — most European and Asian countries
- Ecological reserve: biocapacity exceeds footprint — countries like Canada, Brazil, and some Scandinavian nations
Earth Overshoot Day
Earth Overshoot Day marks the date each year when humanity has used more from nature than the planet can renew in the entire year. After this date, we are operating in ecological deficit.
Trend
| Year | Earth Overshoot Day |
|---|
| 1970 | 29 December |
| 1980 | 3 November |
| 1990 | 11 October |
| 2000 | 23 September |
| 2010 | 7 August |
| 2023 | 2 August |
- Earth Overshoot Day has moved earlier each decade, indicating growing ecological overshoot
- In 2020, it moved later (22 August) due to COVID-19 lockdowns reducing consumption
- There are also national overshoot days: Qatar's is in February, while Jamaica's is in December
Limitations of the Ecological Footprint Concept
- Difficult to measure accurately — relies on many assumptions
- Does not capture all environmental impacts (e.g., biodiversity loss, water pollution, toxic waste)
- Can be misleading when comparing countries with very different geographies
- May underestimate the impact of non-renewable resource depletion
- The biocapacity of ecosystems is not fixed — it changes with management and climate
The Circular Economy
The circular economy is an economic system designed to eliminate waste and keep resources in use for as long as possible, in contrast to the traditional linear economy (take → make → dispose).
Principles of the Circular Economy
- Design out waste and pollution: products designed for disassembly, repair, and recycling
- Keep products and materials in use: through reuse, repair, refurbishment, remanufacturing, and recycling
- Regenerate natural systems: return biological materials to the earth safely
Linear vs Circular Economy
| Linear Economy | Circular Economy |
|---|
| Take → Make → Dispose | Reduce → Reuse → Recycle → Regenerate |
| Extracts virgin resources | Minimises virgin resource extraction |
| Generates waste for landfill or incineration | Designs out waste; materials circulate |
| Short product lifespans | Extended product lifespans through repair and remanufacture |
| Environmental degradation | Reduced environmental impact |
Cradle-to-Cradle Design
Cradle-to-Cradle (C2C) is a design philosophy developed by William McDonough and Michael Braungart that goes beyond simply recycling:
- Technical nutrients: materials (metals, plastics) designed to be continuously recycled without quality loss
- Biological nutrients: materials (natural fibres, food waste) designed to return safely to the biosphere
- Products are designed from the outset for their next use, not for disposal
- Certification programme evaluates products on material health, material reutilisation, renewable energy use, water stewardship, and social fairness
Examples of Circular Economy in Practice