This mini-lesson covers Topic 2 — Resource management & sustainable production: renewable vs non-renewable resources, embodied energy, clean technology, the waste hierarchy, green design and life-cycle analysis (LCA).
Work through each screen, answer the questions as you go (some are wordy, some are calculations) and collect ⭐ stars. Press Start when you are ready.
Every product draws on resources and energy. A renewable resource is replaced naturally within a human lifetime (timber, cotton, wind, solar). A non-renewable resource is finite and runs out (crude oil, metal ores, minerals).
The energy used to extract, process and manufacture a material before it even reaches the user is its embodied energy. Metals and plastics have high embodied energy; recycled feedstocks are far lower.
Key idea: sustainable production means meeting today's needs without stopping future generations from meeting theirs — using resources and energy efficiently.
Efficient production wastes as little material as possible. Material utilisation compares the mass ending up in the product with the mass of raw material started with.
A part is machined from a 500 g billet and finishes at 350 g.
utilisation = (350 ÷ 500) × 100 = 70%
Clean technology designs the pollution out of a process at source, rather than adding filters to clean it up afterwards (end-of-pipe). Examples: closed-loop water systems, low-solvent finishes, energy recovery.
Recycling saves large amounts of embodied energy. Making aluminium from recycled scrap uses roughly 10 MJ/kg, against about 200 MJ/kg for primary aluminium from bauxite — a saving of around 95%.
Watch out: recycling is not free of impact — it still needs collection, sorting and energy. Reducing and reusing sit above recycling in the waste hierarchy.
Tap an action, then tap where it sits in the waste hierarchy.
Green design reduces environmental impact from the outset: fewer materials, lower-impact materials, less energy in use, and design for disassembly, repair and recycling.
A life-cycle analysis (LCA) is a cradle-to-grave audit of a product's impacts across five stages: materials, manufacture, distribution, use and disposal. It reveals where the biggest impacts really are — sometimes the use phase (e.g. a fridge) matters more than manufacture.
Key idea: LCA lets designers compare options fairly and avoid simply shifting impact from one stage to another.
Tap a description on the left, then its term on the right.
Embodied energy varies enormously by material. Primary aluminium is very energy-intensive (~200 MJ/kg), steel much less, and timber lower still — while recycled feedstocks slash these figures. Designers weigh embodied energy against strength, durability and the energy a product uses in service.
Watch out: a low-embodied-energy material that wears out quickly may be worse overall than a tougher, higher-energy one that lasts for decades.
Beyond reduce, reuse and recycle, designers apply the wider 6 Rs: Rethink, Refuse, Reduce, Reuse, Repair and Recycle. They act as prompts at the concept stage — could this product be avoided, simplified, or made to last?
Applied early, the 6 Rs cut impact far more cheaply than trying to fix a wasteful design later.
How a product is powered in manufacture matters as much as its materials. Factories running on renewable electricity (wind, solar, hydro) cut the carbon behind each unit. Clean technology and energy recovery reduce demand at source.
Designers increasingly specify low-carbon supply chains, because a "green" product made with dirty energy is not truly sustainable.
An LCA quantifies impacts (energy, carbon, water, waste) across all five stages. Its power is in comparison: it can show, for example, that a heavier reusable bottle only beats a disposable one after enough uses.
LCAs depend on the boundaries and assumptions chosen, so designers treat them as decision-support, not absolute truth — but they prevent "greenwashing" by exposing hidden trade-offs.
Timber shows sustainable production in action: from responsibly managed forests it is renewable, stores carbon and has modest embodied energy. But it is only sustainable if replanting keeps pace with harvest and transport impacts are controlled.
Key idea: "renewable" is a property of the whole system (managed forest + replanting), not just the material.
Resources: renewable (replaced within a lifetime) vs non-renewable (finite: oil, metals, minerals).
Embodied energy: total energy to extract, process and make a material.
Clean technology: stops pollution at source rather than treating it after.
Waste hierarchy: reduce > reuse > recycle > recover > dispose.
LCA: cradle-to-grave assessment across materials, manufacture, distribution, use and disposal.
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