Unit
- Linear economy: This model follows a take-make-dispose trajectory where raw materials are extracted, transformed into products, used briefly, and discarded. It assumes infinite resources and sink capacity, leading to resource depletion and pollution.
- Circular economy: A regenerative system that designs out waste, keeps materials in use at their highest value, and regenerates natural systems. It decouples economic growth from resource consumption through closed loops.
- Three core principles: 1) Eliminate waste and pollution through upstream design; 2) Circulate products and materials at their highest value through reuse, repair, and recycling; 3) Regenerate nature by returning nutrients to the biosphere.
- Key drivers: Resource price volatility, waste disposal costs, regulatory pressure (e.g., EU Circular Economy Action Plan), consumer demand for sustainable products, and innovation opportunities drive the shift to circularity.
- Role of design: Up to 80% of a product's environmental impact is determined at the design stage. Designers decide material choices, durability, repairability, and end-of-life options, making them pivotal in enabling circular systems.
- Butterfly diagram: A visual framework by the Ellen MacArthur Foundation distinguishes biological cycles (biodegradable materials returning to the earth) and technical cycles (materials staying in closed loops through sharing, reusing, refurbishing, and recycling).
- Comparison with recycling only: Recycling alone is insufficient because it downgrades material quality and requires energy. Circular design prioritizes higher-order strategies like prevention, reuse, and repair before recycling.
- Examples of circular products: A modular smartphone designed for easy repair and upgrade; a carpet tile leased to customers and taken back for remanufacturing; a biodegradable packaging made from agricultural waste that returns nutrients to soil.
- Cradle to Cradle Certified: This certification evaluates products across five categories: material health, material reutilization, renewable energy and carbon management, water stewardship, and social fairness. Products receive a rating from Basic to Platinum, encouraging continuous improvement and transparency in circular material flows.
- Product as a Service (PaaS): Shifting from selling ownership to offering access transforms incentives. Manufacturers retain ownership and responsibility for maintenance, repair, and end-of-life recovery. This model extends product lifespan, reduces waste, and aligns business profitability with resource efficiency, as seen in lighting, tires, and office furniture.
- Material Passports: Digital records detailing the composition, origin, and recyclability of materials in a product. These passports enable future users to identify valuable components for reuse or safe disposal. They support circularity by preserving knowledge across lifecycle stages and facilitating material recovery in buildings, electronics, and vehicles.
Design Principle
Principle: Designing for Circularity from the Start
Definition: Circular design requires that every product decision be made with a full lifecycle perspective, evaluating how materials, components, and systems can be kept in use or safely returned to nature. This replaces the traditional focus on cost, function, and aesthetics alone.
Application: At the concept stage, a designer should ask: Can this product be made with fewer materials? Can it be repaired or upgraded? How will users return it at end-of-life? What renewable or recycled inputs can be used? These questions shape material selection, assembly methods, and business model choices.
Quick Revision
- The linear economy depletes resources and creates waste; circular economy regenerates systems and retains value.
- Three principles: eliminate waste, circulate materials, regenerate nature.
- Design determines 80% of environmental impact, making designers key to circular transitions.
- The butterfly diagram distinguishes biological and technical material cycles.