Circularity Metrics Must Account for Burden Shifting to Ensure True Sustainability

Why It Matters

For designers and engineers, this highlights the critical need to move beyond simplistic 'recyclability' or 'recycled content' metrics. A comprehensive understanding of a product's lifecycle impact is essential to avoid unintended negative consequences and to truly contribute to a circular economy that aligns with broader sustainability goals.

Key Finding

Many tools used to measure how 'circular' a product is don't tell the whole story. They might show improvements in one area, like using recycled materials, but miss negative impacts elsewhere, like increased energy use or social costs, ultimately hindering true sustainability.

Key Findings

• Existing circularity metrics are diverse but often incomplete, failing to address the circular economy concept in its entirety.
• Many metrics can lead to undesirable burden shifting, where improvements in one area are offset by negative impacts in others (environmental, economic, or social).
• Current metrics often under-represent the complexities of multiple product lifecycles and the consequences of material downcycling.
• There is a need for comprehensive metrics that clearly allocate benefits between primary and secondary products to avoid misleading sustainability claims.

Research Evidence

Aim: To critically assess the validity and comprehensiveness of existing circularity metrics for products and services, and to provide recommendations for more robust measurement approaches.

Method: Literature review and critical assessment

Procedure: The researchers reviewed and analyzed a wide range of existing circularity metrics, evaluating their foundations, applications, and validity against predefined requirements and a definition of the circular economy anchored in sustainability. They identified common shortcomings and potential issues like burden shifting and under-representation of complex material flows.

Context: Circular economy, product design, policy making, business strategy, sustainability assessment

Design Principle

Holistic circularity assessment requires accounting for all lifecycle impacts to prevent burden shifting and ensure genuine sustainability.

How to Apply

When developing a new product or service, use a multi-criteria assessment tool that considers resource depletion, waste generation, energy consumption, social equity, and economic viability across all lifecycle stages, rather than relying on a single circularity score.

Limitations

The review is based on existing literature, and the development of new, more comprehensive metrics is ongoing. The practical implementation of complex metrics can also be challenging.

Student Guide (IB Design Technology)

Simple Explanation: When you measure how 'circular' something is, make sure you look at all the effects. Just because you recycle something doesn't mean it's good for the planet if it uses way more energy or causes other problems.

Why This Matters: Understanding the limitations of current circularity metrics is crucial for making informed design decisions that genuinely contribute to sustainability, rather than just appearing to do so.

Critical Thinking: If a product is marketed as 'highly circular' based on a specific metric, what other factors should a consumer or designer consider to ensure it is truly sustainable?

IA-Ready Paragraph: This research highlights the critical need to move beyond simplistic circularity metrics that may obscure unintended consequences. As noted by Corona et al. (2019), 'New circularity metrics are being developed... but they often present contradiction in both form and content, which contributes to confusion and misunderstanding of the CE concept.' Therefore, for this design project, a holistic assessment approach has been adopted, considering not only material recirculation but also energy inputs, waste outputs, and potential social impacts across the entire product lifecycle to avoid burden shifting and ensure genuine sustainability.

Project Tips

• When choosing metrics for your design project, explain why you selected them and acknowledge their limitations.
• Consider how your design choices might shift burdens to other parts of the lifecycle or to different stakeholders.
• Look for case studies that discuss the challenges of implementing circular economy principles and measuring success.

How to Use in IA

• Reference this research when discussing the limitations of chosen metrics or when justifying the selection of a more comprehensive assessment framework for your design project.
• Use the concept of burden shifting to critically evaluate the sustainability claims of existing products or proposed design solutions.

Examiner Tips

• Demonstrate an awareness of the complexities and potential pitfalls in measuring circularity.
• Critically evaluate the metrics used in your own design project and justify their selection.

Independent Variable: Type and comprehensiveness of circularity metrics used.

Dependent Variable: Perceived sustainability of products/services, identification of burden shifting.

Controlled Variables: Definition of circular economy, sustainability principles.

Strengths

• Provides a critical review of a broad range of existing metrics.
• Clearly articulates the problem of burden shifting in circularity assessment.
• Offers recommendations for future metric development.

Critical Questions

• How can we develop standardized, yet flexible, circularity metrics that are universally applicable?
• What are the most effective ways to communicate the limitations of current metrics to designers, businesses, and consumers?

Extended Essay Application

• An Extended Essay could investigate the development and application of a novel, comprehensive circularity metric for a specific product category, comparing its results to existing simpler metrics and analyzing the implications for design strategy.
• Another EE could explore the socio-economic implications of different circularity metrics and how they might influence design choices and market competitiveness.

Source

Towards sustainable development through the circular economy—A review and critical assessment on current circularity metrics · Resources Conservation and Recycling · 2019 · 10.1016/j.resconrec.2019.104498