12. Sustainable and Circular Manufacturing

Introduction and Context

Manufacturing has traditionally been evaluated through the lenses of productivity, quality, cost, delivery, and flexibility. These objectives remain essential, but they are no longer sufficient for strategic production management. Manufacturing systems also consume finite materials, energy, water, and land; generate emissions and waste; and influence environmental and social conditions across global supply chains. Consequently, production managers must now consider not only how efficiently a product is made, but also what resources it requires, what happens during its use, and whether its materials can be recovered after its useful life.

Sustainable manufacturing is the creation of manufactured products through economically sound processes that minimize adverse environmental impacts while conserving energy and natural resources. Circular manufacturing extends this idea by designing production and business systems in which products, components, and materials remain useful for as long as possible. It seeks to replace the conventional linear sequence of extract, make, use, and discard with restorative and regenerative cycles.

For production managers, sustainability is not merely an environmental compliance issue. It affects procurement, process design, plant layout, maintenance, quality, logistics, product strategy, investment appraisal, risk management, and customer relationships. Circularity can reduce dependence on volatile raw-material markets, create new revenue models, and improve resilience. At the same time, poorly designed initiatives may shift burdens from one stage of the life cycle to another, increase operational complexity, or produce attractive but misleading environmental claims.

Learning Objectives

After studying this chapter, students should be able to:

1. Distinguish sustainable manufacturing from circular manufacturing and explain their relationship.

2. Apply life-cycle thinking and life-cycle assessment to manufacturing decisions.

3. Analyse energy use, greenhouse-gas emissions, material flows, and waste.

4. Use eco-design and circular business-model principles in product and process planning.

5. Evaluate remanufacturing, reuse, recycling, industrial symbiosis, and waste-minimization options.

6. Assess the managerial, technological, financial, ethical, and regulatory implications of circular production systems.

7. Develop a practical roadmap for implementing resource-efficient and resilient manufacturing.

From Linear Efficiency to Circular Value Creation

A linear manufacturing system is organized around one-directional material flows. Raw materials are extracted, transformed into products, distributed, consumed, and eventually disposed of or downcycled. Efficiency improvements can reduce the resources used per unit, but they do not necessarily change the underlying logic. If efficiency lowers material intensity while total production and consumption increase substantially, the absolute environmental burden may still grow. This phenomenon is often discussed as a rebound effect.

Sustainable manufacturing adopts a broader performance perspective. Its three interdependent dimensions are environmental integrity, economic viability, and social responsibility. Environmental integrity includes reduced emissions, resource conservation, ecosystem protection, and pollution prevention. Economic viability concerns life-cycle cost, productivity, innovation, profitability, and resilience. Social responsibility includes worker safety, decent work, community effects, human rights, and equitable access to benefits.

Circular manufacturing focuses on closing, narrowing, and slowing resource loops. Closing loops means recovering materials through recycling or industrial processing. Narrowing loops means using fewer resources per product or service. Slowing loops means extending product life through durability, repair, upgrading, reuse, sharing, and remanufacturing. The preferred option is not automatically recycling: retaining a product or component at its highest functional value is commonly more beneficial than reducing it to raw material.

A useful hierarchy is therefore:

• avoid unnecessary demand and hazardous inputs;
• reduce material and energy intensity;
• design for long life, repair, upgrade, and reuse;
• remanufacture or refurbish products and components;
• recycle materials when higher-value options are impractical;
• recover energy or dispose of residuals only as a last resort.

This hierarchy must be interpreted in context. A repair operation that requires long-distance transport or hazardous cleaning may not always outperform local recycling. Decisions require life-cycle evidence rather than slogans.

Life-Cycle Thinking and Assessment

Life-cycle thinking considers all relevant stages of a product or process: extraction and processing of materials, component manufacture, assembly, distribution, use, maintenance, end-of-life treatment, and transport between stages. It prevents managers from optimizing one operation while transferring impacts elsewhere. For example, a lightweight material may reduce use-phase energy but require energy-intensive production or create difficult recycling problems.

Life-cycle assessment (LCA) is a structured method for compiling and evaluating inputs, outputs, and potential environmental impacts throughout a product system. A conventional LCA follows four broad phases:

1. Goal and scope definition. The study identifies its purpose, functional unit, system boundary, audience, and allocation rules. A functional unit provides the basis for comparison, such as one thousand operating hours of a pump rather than one pump. The boundary may cover only factory operations, cradle-to-gate activities, cradle-to-customer activities, or the complete cradle-to-grave life cycle.

2. Life-cycle inventory. Data are collected on materials, electricity, fuels, water, transport, emissions, waste, and other flows. Primary data from the organization are preferred for important processes; secondary databases and documented assumptions may be used for background processes.

3. Life-cycle impact assessment. Inventory flows are translated into impact categories such as climate change, eutrophication, acidification, photochemical smog, resource depletion, water use, and human toxicity. Results should not be reduced to carbon alone when other impacts are material.

4. Interpretation. The analyst identifies significant contributors, tests sensitivity to assumptions, examines data quality, and develops conclusions consistent with the original goal and scope.

LCA can be attributional, describing the average environmental profile of a product system, or consequential, examining changes caused by a decision. It can be used to compare materials, locate environmental hotspots, support eco-design, evaluate suppliers, and substantiate environmental declarations. However, results depend on system boundaries, data quality, allocation procedures, geographic conditions, lifetime assumptions, and end-of-life scenarios. LCA is therefore a decision-support tool, not an automatic answer.

Life-cycle costing complements LCA by examining acquisition, installation, energy, maintenance, downtime, disposal, and residual-value costs. A more expensive high-efficiency machine may be preferable if its operating savings and reliability outweigh its purchase premium. Total cost of ownership is especially important when comparing products sold once with products offered through leasing, performance contracts, or product-as-a-service arrangements.

Measuring Energy, Carbon, Materials, and Waste

Energy management begins with an energy baseline: the quantity and type of energy consumed over a defined period, normalized where appropriate by production volume, operating hours, or product output. Managers should distinguish between total consumption and energy intensity. A plant may reduce energy intensity while total energy use increases because output expands. Energy reviews typically examine motors, compressed air, heating and cooling, furnaces, pumps, lighting, utilities, and idle or standby losses.

Carbon accounting separates direct and indirect emissions. Direct emissions arise from sources controlled by the organization, such as fuel combustion in a furnace. Indirect energy emissions arise from purchased electricity, steam, heating, or cooling. Other value-chain emissions may include purchased materials, inbound and outbound logistics, product use, employee travel, and end-of-life treatment. The exact categorization depends on the accounting framework used, but the managerial principle is clear: carbon reduction requires visibility beyond the factory boundary.

A carbon footprint should state its organizational or product boundary, reporting period, emission factors, data sources, and treatment of renewable energy claims. Carbon intensity metrics may be expressed per unit of product, revenue, operating hour, or functional performance. The choice of denominator affects interpretation; revenue-based intensity, for instance, may improve because of price changes rather than technical improvement.

Material-flow analysis (MFA) tracks the movement of materials through a process, facility, or supply chain. A basic material balance is:

Material input = product output + recoverable by-products + waste and emissions + inventory change.

The balance helps reveal yield losses, excessive trimming, rejected products, packaging waste, evaporation, leakage, and unrecorded disposal. Material productivity can be improved through process redesign, near-net-shape manufacturing, better nesting and cutting plans, quality-at-source, predictive maintenance, and recovery of valuable by-products.

Waste should be measured by type, source, hazard, treatment route, and economic value. The waste hierarchy prioritizes prevention, reduction, reuse, recycling, recovery, and disposal. A zero-waste target can stimulate improvement, but managers must define it carefully and avoid excluding difficult waste streams or transferring waste to external contractors without understanding its final fate.

Eco-Design as a Production and Product Decision

Eco-design integrates environmental criteria into product development from the earliest stages. Decisions made during design influence material selection, process energy, product durability, repairability, packaging, transport, and end-of-life recovery. Since changing a design late in development is costly, environmental requirements should be included in the product brief, design reviews, supplier specifications, and verification procedures.

Important eco-design principles include:

• reducing the quantity and toxicity of materials;
• selecting recycled, renewable, or responsibly sourced inputs where technically suitable;
• designing for durability, modularity, disassembly, repair, upgrade, and remanufacture;
• reducing the number and diversity of incompatible materials;
• identifying materials and components for sorting and recovery;
• minimizing energy and water during manufacture and use;
• designing packaging for efficient transport and repeated use;
• providing maintenance information, spare parts, and digital product documentation.

Design trade-offs are unavoidable. A heavier product may last longer; a bonded joint may improve reliability but hinder disassembly; recycled material may have variable quality; and a modular design may increase initial material use while reducing life-cycle impacts. Tools such as design-for-environment checklists, LCA screening, failure-mode analysis, material circularity indicators, design scoring, and design-for-disassembly reviews help make these trade-offs explicit.

Circular Strategies and Business Models

Circularity is not limited to waste treatment. It changes how value is created and captured. Product-life extension strategies include repair, maintenance, refurbishment, upgrading, and remanufacturing. Sharing and product-service systems increase utilization of assets, while leasing and take-back systems can give manufacturers greater control over product recovery. Industrial symbiosis connects organizations so that one firm's by-products, waste heat, water, or underused capacity becomes another firm's input.

Remanufacturing is a controlled industrial process that returns used products or components to a condition equivalent to, or better than, their specified performance. It generally involves collection, inspection, disassembly, cleaning, repair or replacement, reassembly, testing, and warranty or quality assurance. It differs from simple repair because it is systematic, repeatable, and normally restores a defined performance standard. Successful remanufacturing requires product designs that permit disassembly, reliable reverse logistics, identification of product condition, component standardization, and markets willing to accept remanufactured goods.

Recycling breaks products into materials for use in new products. It is valuable when products cannot be reused or remanufactured, but it usually destroys the functional energy and labour embedded in components. Downcycling produces material of lower quality or value. Managers should therefore compare the technical, economic, environmental, and social performance of multiple recovery routes rather than treating all recycling as equivalent.

Circular business models include:

1. Circular supplies: renewable, recycled, or responsibly recovered inputs replace virgin resources.

2. Resource recovery: materials, chemicals, nutrients, or energy are recovered from residual streams.

3. Product life extension: repair, refurbishment, remanufacturing, and upgrades retain product value.

4. Product-service systems: customers purchase access, availability, or performance rather than ownership of a physical product.

5. Sharing platforms: higher utilization allows fewer physical assets to provide a given service.

Each model changes operational requirements. Product-as-a-service may improve return rates and design feedback, but it requires asset tracking, maintenance capability, financial capacity, customer trust, and careful residual-value management.

Industrial Symbiosis and Network-Level Resource Efficiency

Industrial symbiosis involves planned exchanges of materials, energy, water, infrastructure, logistics, or services among geographically connected organizations. A food-processing plant might supply organic residues to an anaerobic-digestion facility; recovered heat from one operation might serve another; treated wastewater might replace freshwater for a suitable industrial use. Such exchanges can reduce disposal costs and virgin-resource demand while improving regional resilience.

The implementation process normally includes mapping local material and energy flows, identifying compatible demand and supply, assessing technical specifications and contamination risks, evaluating transport and storage, assigning ownership and liability, and developing contracts and monitoring arrangements. Symbiosis is not simply an informal exchange of waste. Quality standards, continuity of supply, regulatory permissions, emergency arrangements, and economic incentives must be established.

Digital Enablement and Analytics

Digital technologies can make circular systems observable and controllable. Internet-of-Things sensors provide data on energy, water, machine condition, product location, and operating performance. Manufacturing execution systems can connect process data with batch, quality, and material information. Digital product passports may store information about composition, repair history, embedded components, hazardous substances, and recovery instructions. Such information supports sorting, maintenance, remanufacturing, compliance, and customer transparency.

Analytics can identify energy baselines, detect abnormal consumption, predict equipment failure, optimize production schedules, estimate remaining useful life, and compare alternative process routes. Artificial intelligence may assist in visual sorting, defect detection, demand forecasting, reverse-logistics planning, and disassembly decisions. Nevertheless, digitalization also consumes energy, creates electronic waste, and introduces cybersecurity, privacy, interoperability, and data-governance risks. A digital solution should be evaluated through its own life cycle and should not be assumed sustainable merely because it is automated.

A Managerial Roadmap for Implementation

A practical circular-manufacturing programme begins with strategic intent rather than isolated recycling projects. Senior management should define objectives linked to business value, environmental outcomes, and stakeholder expectations. The organization then establishes a baseline using energy, carbon, material, waste, cost, quality, and asset-utilization data.

The next step is hotspot identification. LCA, MFA, value-stream mapping, energy audits, supplier assessment, and failure data can reveal where the greatest impacts and losses occur. Options should be generated across the hierarchy: prevention, efficiency, life extension, recovery, and disposal control. Each option requires a multidimensional appraisal covering capital cost, operating cost, reliability, quality, safety, regulatory exposure, customer acceptance, carbon, resource use, and implementation risk.

Pilot projects should be selected where measurement is feasible and learning can be rapidly obtained. Examples include compressed-air reduction, reusable packaging, component remanufacturing, scrap segregation, predictive maintenance, or supplier take-back. Performance indicators must distinguish activity from outcome. The number of products collected is an activity measure; the proportion successfully reused or remanufactured is an outcome measure.

Governance should assign ownership across engineering, purchasing, operations, quality, finance, marketing, maintenance, logistics, and information technology. Supplier and customer collaboration is often essential because circularity crosses organizational boundaries. Results should be reviewed through management systems, audited where claims are public, and communicated with transparent assumptions.

Illustrative Case: Remanufacturing Industrial Hydraulic Pumps

Background

The following is an illustrative case designed for academic analysis. A manufacturer of industrial hydraulic pumps sells durable equipment to construction and material-handling companies. Many pumps are replaced because of worn seals, bearings, and housings even though major components remain functional.

Situation and Problem

The company faces rising alloy prices, long lead times for castings, and customer pressure to reduce the environmental impact of equipment. Its existing business is based mainly on selling new pumps. Returned pumps are irregularly collected, and service departments lack reliable information about condition and history. Management must determine whether a remanufacturing programme is technically and economically justified.

Analysis

A preliminary material-flow study shows that the largest avoidable losses occur in discarded housings and rotors. An LCA screening indicates that manufacturing replacement metal components is more resource-intensive than cleaning, inspecting, and reusing many existing components, although the result depends on transport distances, cleaning energy, rejection rates, and the assumed life of the remanufactured pump. Life-cycle costing identifies additional benefits from reduced inventory exposure and faster service, but also reveals costs for inspection equipment, reverse logistics, testing, warranty management, and technician training.

The engineering team classifies components according to failure mode and establishes acceptance criteria. A digital serial-number system records operating hours, repair history, materials, and test results. Procurement negotiates return agreements with major customers, while sales develops a warranty-backed remanufactured product positioned for applications where new equipment is not essential.

Approach and Solution

The company introduces a core-return system. Returned pumps are inspected at a regional centre, disassembled, cleaned using controlled processes, measured, and classified. Reusable components are reconditioned; nonconforming parts are replaced; and irreparable materials are sent to qualified recyclers. Each remanufactured pump undergoes pressure, leakage, and performance testing. The programme begins with one pump family to limit variation and generate reliable data.

Key indicators include return rate, usable-component yield, remanufacturing lead time, warranty failure rate, virgin-material avoided, energy use per remanufactured unit, customer acceptance, and total margin. The company avoids claiming that every remanufactured pump is automatically environmentally superior; instead, it reports the boundary and assumptions used in its comparison.

Outcome

The pilot demonstrates that circular value depends on coordinated design, reverse logistics, quality assurance, information systems, and market communication. The company gains a second revenue stream and reduces exposure to selected material shortages. It also learns that low return rates and inconsistent product identification can undermine the economics. Consequently, future pump designs include standardized fasteners, accessible wear parts, and clearer disassembly instructions.

Learning Points

The case illustrates that remanufacturing is a production system, not merely a repair activity. It requires product design, process capability, supplier and customer cooperation, financial analysis, and credible environmental measurement. It also shows why an organization should pilot, measure, and refine a circular model rather than assume that a theoretically attractive loop will operate successfully at scale.

Challenges, Risks, and Common Mistakes

Circular manufacturing can fail when managers focus on visible waste while ignoring product design, purchasing specifications, or use-phase impacts. Other common mistakes include using incomparable functional units, relying on unverified emission factors, counting recycled content without assessing actual recovery, and reporting percentage improvements without a baseline.

Supply variability is a major risk when secondary materials do not meet consistent specifications. Reverse logistics may generate additional transport emissions. Product take-back can create liability for hazardous substances, data-bearing devices, or contaminated equipment. Remanufactured products may face customer distrust, unclear warranties, or channel conflict with new-product sales. Investments may also have long payback periods, particularly when energy prices are uncertain.

There are ethical risks in exporting used products or waste to jurisdictions with weaker controls, shifting pollution to communities with limited bargaining power, or presenting selective environmental information as a complete sustainability claim. Circularity must not become an excuse for unsafe working conditions, planned obsolescence, excessive surveillance through connected products, or transferring maintenance responsibilities to customers without support.

Governance, Standards, and Professional Responsibility

Environmental claims should be accurate, specific, verifiable, and proportionate to the evidence. Organizations should document boundaries, assumptions, data sources, exclusions, and uncertainty. Environmental management systems, energy-management systems, product environmental declarations, extended producer responsibility requirements, waste regulations, chemicals controls, and occupational-safety rules may apply depending on jurisdiction and sector.

Governance arrangements should define who owns product data, returned materials, environmental targets, and supplier performance. Internal controls are needed for mass-balance claims, renewable-energy certificates, recycled-content calculations, and carbon offsets. Offsets, where used, should not substitute for direct emissions reduction and should be disclosed separately from operational performance.

Current Developments and Best Practices

Important developments include product-passport systems, right-to-repair requirements, recycled-content markets, industrial decarbonization, electrification of process heat, low-carbon materials, additive manufacturing with optimized material use, and regionalized reverse supply chains. Artificial intelligence and digital twins are increasingly used to estimate remaining useful life and simulate resource flows, but their value depends on data quality and accountable decision-making.

Best practice is characterized by several principles: set measurable objectives; prioritize prevention and life extension; use life-cycle evidence; integrate sustainability with quality and productivity; design for disassembly and recovery; collaborate across the value chain; measure absolute as well as intensity-based performance; pilot before scaling; verify public claims; and review environmental, economic, and social outcomes together. A circular manufacturing system is resilient not because it eliminates all risk, but because it reduces unnecessary dependence on scarce resources and develops multiple pathways for maintaining value.

Chapter Summary

Sustainable manufacturing integrates environmental, economic, and social performance into production decisions. Circular manufacturing goes further by retaining products, components, and materials at their highest practical value through reduction, repair, reuse, remanufacturing, recycling, and industrial symbiosis. Life-cycle thinking and LCA prevent burden shifting and identify environmental hotspots, while life-cycle costing supports economically informed choices. Energy, carbon, material-flow, and waste analytics provide the evidence needed for improvement.

Eco-design influences much of a product’s life-cycle performance by addressing durability, repairability, modularity, material selection, energy use, and recovery. Circular business models alter ownership, service, return, and revenue arrangements. Digital technologies can improve traceability and optimization, but they introduce their own resource, cybersecurity, and governance concerns. Effective implementation requires cross-functional leadership, reliable data, pilot projects, supplier and customer cooperation, transparent claims, and attention to ethical and regulatory responsibilities.

Key Terms

Sustainable manufacturing: Production that is economically viable while minimizing environmental harm and supporting social responsibility.

Circular manufacturing: Manufacturing that keeps products, components, and materials in productive use through restorative loops.

Life-cycle thinking: Consideration of impacts and resources across all relevant stages of a product’s life.

Life-cycle assessment (LCA): A method for evaluating environmental inputs, outputs, and impacts across a defined product system.

Functional unit: The quantified reference against which life-cycle performance is compared.

System boundary: The defined set of processes included in an assessment.

Life-cycle costing: Evaluation of costs incurred throughout acquisition, operation, maintenance, and end-of-life.

Carbon footprint: Greenhouse-gas emissions associated with a defined organization, product, process, or activity.

Material-flow analysis: Systematic tracking of material inputs, outputs, stocks, and losses.

Eco-design: Incorporation of environmental considerations into product and process design.

Product-life extension: Strategies such as repair, maintenance, upgrading, and refurbishment that prolong useful life.

Remanufacturing: Controlled industrial restoration of used products or components to a specified performance standard.

Recycling: Processing discarded materials into inputs for new products or processes.

Industrial symbiosis: Exchange of materials, energy, water, infrastructure, or services among organizations.

Product-service system: A business model selling access, availability, or performance rather than only product ownership.

Reverse logistics: Movement of used, returned, repaired, or recovered products and materials toward recovery or reuse.

Circular business model: A model that creates and captures value while reducing resource extraction and waste.

Rebound effect: Increased consumption or activity that offsets some benefits of improved efficiency.

Digital product passport: Structured digital information about a product’s composition, history, use, repair, and recovery.

Extended producer responsibility: A policy approach assigning producers responsibility for products through specified post-consumer stages.

Review Questions

Short Answer Questions

1. How does circular manufacturing differ from conventional linear manufacturing?

2. What is the purpose of a functional unit in LCA?

3. Distinguish between energy intensity and total energy consumption.

4. Why is remanufacturing different from ordinary repair?

5. What is meant by industrial symbiosis?

Long Answer Questions

1. Explain the four phases of life-cycle assessment and discuss the importance of system boundaries and data quality.

2. Discuss how eco-design can support product durability, repair, remanufacturing, and recycling.

3. Explain the relationship between sustainable manufacturing and circular manufacturing, using suitable examples.

4. Examine the managerial requirements for implementing a product-as-a-service business model.

5. Discuss the opportunities and risks associated with digital technologies in circular manufacturing.

Analytical / Application Questions

1. A factory reduces energy use per unit by 12 percent while total output rises by 25 percent. Analyse what can and cannot be concluded about its environmental performance.

2. A manufacturer must choose between recycling an old machine housing locally and remanufacturing it at a distant specialist facility. Develop a decision framework using LCA, life-cycle costing, quality, logistics, and risk criteria.

3. Design a one-year implementation roadmap for a medium-sized manufacturer seeking to reduce virgin-material dependence and establish a remanufacturing pilot.

22. Multiple Choice Questions with Answers

Question 1

Which statement best describes the central distinction between linear and circular manufacturing?

A. Linear manufacturing uses automation, whereas circular manufacturing does not.

B. Linear manufacturing focuses only on quality, whereas circular manufacturing focuses only on cost.

C. Linear manufacturing generally ends with disposal, whereas circular manufacturing seeks to retain product, component, and material value.

D. Linear manufacturing is always less energy efficient than circular manufacturing.

Correct Answer: C. Linear manufacturing generally ends with disposal, whereas circular manufacturing seeks to retain product, component, and material value.

Question 2

A company compares two pumps that deliver the same flow for different operating lifetimes. Which LCA element allows a meaningful comparison?

A. The company’s annual revenue

B. A functional unit representing the service delivered

C. The purchase price alone

D. The number of employees producing each pump

Correct Answer: B. A functional unit representing the service delivered

Question 3

Which action normally retains the highest level of product value?

A. Disposal in a controlled landfill

B. Energy recovery from discarded materials

C. Recycling the product into raw material

D. Repairing and continuing to use the product

Correct Answer: D. Repairing and continuing to use the product

Question 4

A plant’s energy consumption per unit falls, but its total energy consumption rises. Which explanation is most plausible?

A. The plant has necessarily eliminated all energy waste.

B. Production volume increased enough to offset the intensity improvement.

C. The energy baseline is irrelevant to performance measurement.

D. Energy intensity and total consumption always move in opposite directions.

Correct Answer: B. Production volume increased enough to offset the intensity improvement.

Question 5

Which activity is most characteristic of remanufacturing rather than simple repair?

A. Replacing one failed part without testing the product

B. Selling a used product without inspection

C. A controlled process of inspection, disassembly, restoration, reassembly, and performance testing

D. Sending all returned products directly to a recycler

Correct Answer: C. A controlled process of inspection, disassembly, restoration, reassembly, and performance testing

Question 6

What is the primary purpose of material-flow analysis?

A. To track material inputs, outputs, stocks, and losses

B. To calculate employee satisfaction

C. To determine product advertising expenditure

D. To replace all financial accounting systems

Correct Answer: A. To track material inputs, outputs, stocks, and losses

Question 7

A company claims that its product is sustainable because it contains recycled material. What is the most appropriate managerial response?

A. Accept the claim without further investigation.

B. Assess the complete life cycle, including durability, production impacts, use, and end-of-life.

C. Reject all recycled materials as environmentally harmful.

D. Measure only the product’s purchase price.

Correct Answer: B. Assess the complete life cycle, including durability, production impacts, use, and end-of-life.

Question 8

Which example best illustrates industrial symbiosis?

A. A firm improves its internal production schedule.

B. A manufacturer sells new products through a retailer.

C. One company supplies usable waste heat to a neighbouring company.

D. A customer disposes of packaging in a household bin.

Correct Answer: C. One company supplies usable waste heat to a neighbouring company.

Question 9

Why can digital technology create sustainability risks as well as benefits?

A. Digital systems cannot measure resource use.

B. Digital systems may consume energy, generate electronic waste, and create data-governance risks.

C. Automation always increases material waste.

D. Digital systems eliminate the need for human decisions.

Correct Answer: B. Digital systems may consume energy, generate electronic waste, and create data-governance risks.

Question 10

Which is the strongest first step when implementing a circular-manufacturing programme?

A. Purchase advanced technology before defining objectives.

B. Publicize a zero-waste claim without a baseline.

C. Establish strategic objectives and a reliable baseline of resource and waste performance.

D. Outsource all waste immediately without examining its final treatment.

Correct Answer: C. Establish strategic objectives and a reliable baseline of resource and waste performance.