Circular Economy and Sustainability: How They Differ

A circular economy is a method, and sustainability is the outcome it is meant to serve. The two overlap heavily, but they are not the same thing. A product can be highly recycled and still carry a large carbon footprint, and a business can report rising recovery rates while its total material use keeps growing. A clear distinction makes it easier to judge which circular projects are worth funding.

Key Takeaways

• Circularity describes how materials flow, while sustainability covers wider environmental and social outcomes.
• A European Environment Agency review found an average 33% emissions reduction potential, a theoretical estimate, with individual studies ranging from 2% to 99%.
• Only 6.9% of materials entering the global economy in 2021 were secondary materials.
• Circular activity can raise total production, a risk known as circular economy rebound.
• Judge circular claims by absolute impact, displaced production and the full life cycle.

How Are Circularity and Sustainability Related?

A circular economy keeps products and materials in use through steps such as reuse, repair and recycling. Done well, this can reduce demand for new materials and the waste that follows their use. That supports several sustainability goals, because extraction, processing and disposal all carry environmental costs. Sustainability is the broader test. It also asks about energy sources, water, land, working conditions and whether communities benefit.

This means the two ideas can pull in different directions. A recycling process powered by fossil fuels still produces emissions, so material savings alone do not prove a climate gain. An informal recovery chain may keep materials in circulation while exposing workers to harm. Neither case fails on material flow, but a circularity score alone will not reveal either problem.

How Much Can a Circular Economy Reduce Emissions?

The evidence is promising but uncertain. The European Environment Agency’s 2026 briefing reviewed 131 publications and found an average reduction potential of 33%, with individual estimates ranging from 2% to 99%. Average results by sector were:

The agency calls the 33% figure a theoretical estimate and not a forecast of what can be achieved. Studies use different methods and baselines, and most focus on developed countries. Any company quoting a single number should state those limits. The review supports the direction of the effect, while its size depends heavily on the sector and the specific action.

Why Hasn’t More Recycling Closed the Circularity Gap?

The circularity gap is the distance between today’s economy and one that relies far more on secondary materials, meaning recycled materials used in place of newly extracted ones. Circularity is a share of total material use, so it can fall even when recycling grows, if total use grows faster. According to the EU Circular Economy Stakeholder Platform’s summary of the Circularity Gap Report 2025, 6.9% of materials entering the global economy in 2021 were secondary materials, 0.3 percentage points lower than in 2018. Only 11.2% of the materials leaving the economy were recycled.

Circle Economy, which publishes the report, aims to raise global circularity to 17% by 2032 to help limit warming to below 2 degrees. Its 2026 edition adds a “Value Gap” measure covering avoidable value lost through inefficient material use, premature obsolescence and asset deterioration. The measure frames the problem as lost value across the economy, not only as a shortage of recycling.

Can Circular Practices Backfire?

Yes. In a 2017 paper in the Journal of Industrial Ecology, Trevor Zink and Roland Geyer described “circular economy rebound”, where circular activity increases overall production and partly or fully offsets its benefits.

A refurbished phone, for example, only saves resources if it replaces a new one. If it instead reaches a buyer who would otherwise have bought nothing, or if lower prices raise total consumption, the saving shrinks. Secondary materials also may not substitute fully for primary ones, particularly when quality falls during recycling.

An assessment should also check for trade-offs that are specific to a product:

• Longer transport: emissions from collecting and shipping materials over long distances may reduce the benefit.
• Extended use of inefficient products: compare the energy an older appliance uses with the impact of making a more efficient replacement.
• Protective packaging: removing material may increase spoilage, so count the food as well as the pack.

These risks are reasons to measure circular practices as a system, and they do not rule the practices out.

Where Do Circularity and Sustainability Align?

Food waste prevention is a clear example of the overlap. UN News, reporting on UNEP’s Food Waste Index, says 1.05 billion tonnes of food went to waste in 2022, and that food loss and waste generates up to 10% of global greenhouse gas emissions. Food that is eaten as intended avoids waste while also making better use of the land, water and energy that produced it. Rebound can still apply if the money saved goes on other high-impact purchases.

For a company-level view of how circular economy and sustainability connect in food manufacturing, Ajinomoto Malaysia provides one published example. Its page says it targets a 75% food waste reduction across production by 2031, and that it sends organic waste to compost, fertiliser or renewable energy. It also describes life cycle assessment as a way to measure a product’s total footprint. The page does not publish baselines or progress data, so outsiders can assess the approach but not yet the results.

How Can You Test a Circular Claim?

Ask five questions before accepting a circular claim, or before making one:

1. Did absolute impact fall? A better recycling rate means less if total waste, emissions or material use rose.
2. What did it displace? Look for evidence that the circular product replaced new production and did not simply add to it.
3. Is the full life cycle covered? Check whether the boundary includes energy, transport, use and disposal.
4. Does the local system exist? A recyclable or compostable label means little where nobody collects the material.
5. Who bears the cost? Check labour conditions in collection and sorting, and whether risks move to another country or community.

Take a hypothetical bottle advertised as made with 50% recycled plastic. The figure answers none of these questions by itself. The claim becomes stronger if the seller shows lower life cycle emissions and total plastic use, and explains where the bottle can be collected.

Frequently Asked Questions

Is the circular economy the same as sustainability?

No. The circular economy concerns how materials and products flow through the economy. Sustainability is the wider goal, covering climate, nature, health and social outcomes. Circular methods can support it but do not guarantee it.

Does the circular economy always reduce emissions?

No. Reviewed estimates vary widely by sector and method, and effects such as rebound or long-distance transport can reduce the benefit. Each project needs its own life cycle assessment.

What is circular economy rebound?

It is the risk that circular activity raises total production or consumption, cancelling some or all of its environmental gains. It occurs when secondary goods fail to fully replace new ones, or when lower prices increase demand.

Measure the Outcome, Not the Loop

Circular projects deserve support when they lower absolute impact. Start by choosing one outcome that matters, such as emissions or total material use, and track it alongside any circularity metric. If the two move in opposite directions, the outcome should decide what happens next.

Sources

• Assessing the climate mitigation potential of circular economy, European Environment Agency, 19 February 2026.
• Circularity Gap Report 2025, European Circular Economy Stakeholder Platform summary.
• Circularity Gap Report 2026, European Circular Economy Stakeholder Platform summary.
• Global circularity rate fell to 6.9%, Circle Economy.
• Zink, T. and Geyer, R. (2017). Circular Economy Rebound. Journal of Industrial Ecology, 21(3), 593-602.
• With 783 million people going hungry, a fifth of all food goes to waste, UN News, 27 March 2024.
• Circular economy page, Ajinomoto Malaysia (linked in the article above), retrieved 2 November 2026.