The big idea: Sustainability means development that can last — meeting today's needs without ruining the ability of future generations to meet theirs. Growth that burns through the planet or its people is not sustainable, however fast it looks.
Sustainability is not only about the environment. It has three sides: environmental (nature and climate), social (fair, stable societies) and economic (an economy that can keep going). Development is only real if it is sustainable across all three.
- Environmental — not exhausting resources or wrecking the climate and ecosystems.
- Social — fair, stable, healthy societies that people want to keep living in.
- Economic — an economy that can keep functioning, not built on a bubble or debt.
- Sustainable development — the idea that ties them together.
(Un)sustainability of systems: Sustainability describes whether a whole system or practice can continue. A way of producing food, energy or growth that depletes soil, water or the climate is unsustainable — it works now but cannot last. Spotting what is (un)sustainable is a key exam skill.
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The sharpest debate is whether the planet's limits mean traditional development — endless growth — cannot continue. Climate change is the clearest example.
Case study — climate change and the limits of growth: For two centuries, development has meant burning fossil fuels for ever more growth. But this drives climate change.
What climate change now threatens
- Food, water, health and safe homes — the very things development is meant to deliver.
- Poorer countries are hit hardest, though they did least to cause it.
This forces a hard question:
Keep going?
- Can we keep pursuing growth-based development
- on a planet with environmental limits?
Or change?
- Must development itself change
- to become sustainable?
So sustainability turns the whole theme's question around. It is not just 'how do we develop?' but 'can development continue at all in its current form?' — and if not, what a sustainable version would look like.
The key point: Sustainability is development that can last — across environmental, social and economic pillars. Climate change shows growth-based development can undermine its own future, so sustainability asks not just how to develop, but whether current development can continue at all.
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Do the challenges of sustainability mean development may no longer be possible — or can development be made sustainable? A key recurring debate. Weigh it.
The 'limits to growth' worry
Some argue a planet with finite resources cannot support endless economic growth for everyone, so the traditional development model — grow the economy without limit — is heading for collapse and must change.
The 'sustainable development' reply
Others argue development need not be abandoned but redefined: clean energy, efficiency and green technology can let economies grow while cutting harm, so development and sustainability can be reconciled rather than being enemies.
Two perspectives — weigh them: One view: sustainability's challenges mean development as we know it may no longer be possible. Another view: development can be made sustainable through green technology and a redefined model. Strong essays evaluate both, often concluding traditional growth-only development is in doubt but sustainable development remains possible.
How sustainability comes up in Paper 2: A Paper 2 essay might ask whether sustainability makes development impossible. Weigh 'growth has limits' against 'development can be made sustainable', then reach a judgement.
The 15-mark markband (what moves you up)
Bands 1–6
Mostly descriptive; perspectives not identified.
avoid
Bands 7–9
Clear knowledge, but perspectives identified, not explored.
7–9
Bands 10–12
Well-supported argument; perspectives explored.
10–12
Bands 13–15
Balanced, compelling; perspectives explored AND evaluated.
13–15
Evaluate the claim that the challenges of sustainability mean that development may no longer be possible.
Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
Common mistakes: 1. Treating sustainability as only 'the environment'. It has three pillars.
2. No real case. Use climate change / renewables / SDGs.
3. All-or-nothing. Distinguish growth-only development from sustainable development.
4. Naming the three pillars and moving on. Show where two of them pull against each other.
5. No judgement. Conclude on whether development can continue.