Life Cycle Assessment: Why Understanding Product Impacts Matters

Introduction

Companies increasingly need to understand the environmental consequences of the products they manufacture, purchase, and sell. Carbon emissions are an important part of that picture, but they are not the only one. Products also consume raw materials, energy and water, generate waste and pollution, and can affect ecosystems at different stages of their life cycle.

Life Cycle Assessment, usually referred to as LCA, provides a structured method for examining these impacts.

Rather than looking only at what happens inside a factory, LCA follows a product across its life cycle. Depending on the scope of the assessment, this can include raw material extraction, processing, manufacturing, packaging, transport, use, maintenance, recycling, and final disposal.

The basic principle is straightforward: environmental decisions should consider the whole system rather than improving one stage while unintentionally increasing impacts somewhere else.

This makes LCA particularly relevant to companies working on net-zero strategies, circular economy initiatives, sustainable product design, procurement, environmental claims and supply chain management.

What Is Life Cycle Assessment?

Life Cycle Assessment is a systematic method for evaluating the environmental inputs, outputs and potential impacts associated with a product or service throughout its life cycle.

The internationally recognised framework is established principally through ISO 14040 and ISO 14044. ISO 14040 defines the principles and framework of LCA, while ISO 14044 provides requirements and guidelines for carrying out assessments.

Under these standards, an LCA typically consists of four interconnected stages:

1. Goal and scope definition

2. Life cycle inventory

3. Life cycle impact assessment

4. Interpretation

The first stage determines what the study is trying to answer. A company might want to compare two packaging systems, identify the largest environmental impacts of a product, assess alternative materials, or understand where emissions arise in a supply chain.

The life cycle inventory then records the relevant inputs and outputs associated with the system being studied. These can include energy, fuels, raw materials, water, transport, emissions and waste.

The impact assessment translates those flows into environmental impact categories. Depending on the methodology, these may include climate change, water use, resource depletion, acidification, eutrophication, land use and other environmental pressures.

Finally, the results are interpreted to identify hotspots, understand trade-offs and determine what conclusions can reasonably be drawn.

An LCA is therefore not simply a calculation. It is a structured decision-making process.

Why Product Life Cycles Matter

Environmental impacts rarely occur in only one place.

Consider a simple consumer product. Its manufacturing facility might use relatively little energy, but the materials used to make the product could require energy-intensive mining or processing. Alternatively, manufacturing may represent a small share of the overall footprint because most impacts occur when customers use the product.

An appliance, for example, may require materials, manufacturing, packaging and transportation before reaching a customer. But electricity consumption during several years of use could represent a substantial part of its climate impact.

The opposite can also occur. For some products, most emissions are already embedded in the materials and manufacturing process before the product reaches the consumer.

Without a life cycle perspective, companies can focus resources on environmental improvements that appear significant operationally but make little difference to the overall footprint.

LCA helps identify where environmental impacts actually occur.

This concept is often described as identifying environmental hotspots.

Once those hotspots are known, businesses can prioritise interventions more effectively. A manufacturer might discover that changing a raw material produces a larger environmental benefit than reducing packaging. Another may find that increasing product durability is more important than changing manufacturing energy consumption.

The value of LCA therefore lies partly in helping organisations determine where action is most likely to matter.

Avoiding Environmental Burden Shifting

One of the most important functions of LCA is preventing environmental burden shifting.

A solution can reduce one environmental impact while increasing another.

Replacing one packaging material with another might reduce plastic consumption but increase product weight, transport emissions, or water use. A reusable container may require more material and energy to manufacture than a disposable one but perform better if it is reused enough times. An electric device may eliminate direct fuel combustion while increasing demand for batteries, metals, or electricity.

None of these examples automatically means that one option is environmentally preferable.

The answer depends on the complete system.

This is why environmental decisions based on a single indicator can be misleading.

Carbon footprinting is particularly important for net-zero strategies, but climate change represents only one environmental dimension. A product with lower greenhouse gas emissions could still have greater impacts on water resources, ecosystems or material consumption.

LCA provides a framework for examining these trade-offs rather than assuming that improvement in one category represents improvement everywhere.

UNEP has highlighted this ability to identify environmental hotspots, compare alternatives and avoid shifting impacts between stages of a value chain as one of the principal advantages of life cycle approaches.

LCA and Product Carbon Footprints

Life Cycle Assessment and product carbon footprinting are closely related but are not the same.

A product carbon footprint concentrates specifically on greenhouse gas emissions associated with a product.

A full environmental LCA can consider multiple impact categories.

The GHG Protocol Product Life Cycle Accounting and Reporting Standard, for example, provides companies with a framework for calculating greenhouse gas emissions and removals associated with specific products. Its objective is to help organisations understand product-related emissions and identify opportunities to reduce them.

For companies pursuing net-zero targets, product carbon footprints can therefore provide important information about where emissions occur.

But broader LCA can answer additional questions.

A company changing the composition of a product may want to know not only whether the change reduces greenhouse gas emissions, but whether it creates significant consequences for water consumption, resource use, or other environmental impacts.

This broader perspective becomes particularly important when businesses are making major design or material decisions.

LCA as a Product Design Tool

Many environmental impacts are effectively determined before a product enters production.

Material selection, weight, energy efficiency, expected lifetime, repairability, packaging, and end-of-life options are often established during the design process.

Changing these characteristics after a product has reached mass production can be expensive and difficult.

LCA can therefore be particularly valuable when used early in product development.

Design teams can compare materials, manufacturing processes and product configurations before decisions become locked into the final design.

For example, an LCA might help determine whether reducing the quantity of a high-impact material provides a greater benefit than substituting it entirely. It could compare a lightweight product with a more durable alternative or examine whether designing a component for reuse meaningfully lowers its lifetime impact.

This does not mean that every design decision needs a full-scale LCA.

Simplified assessments and screening LCAs can also help companies identify the most important variables before conducting more detailed studies where necessary.

The important point is that environmental performance becomes part of product engineering rather than an assessment performed only after the product has already been designed.

Connecting LCA With the Circular Economy

Life Cycle Assessment and circular economy strategies are closely connected, but they measure different things.

Circular economy strategies seek to keep products and materials in productive use through durability, repair, reuse, refurbishment, remanufacturing and recycling.

However, a product being circular does not automatically mean that it has a lower overall environmental impact.

A reusable product, for example, may require more material and energy during manufacturing. Its environmental advantage depends on how many times it is reused, how it is transported and cleaned, and what disposable alternative it replaces.

Similarly, recycled material can reduce demand for virgin resources, but recycling itself requires collection, sorting, transportation, and processing.

LCA can help evaluate whether circular strategies produce genuine environmental improvements.

This makes it a useful complement to circularity indicators.

Circularity tells companies something about how materials and products move through the economy. LCA helps determine the environmental consequences of those flows.

Together, these approaches provide a stronger basis for product sustainability decisions than either can provide alone.

The Role of the Functional Unit

Comparing products fairly is one of the most important and sometimes misunderstood aspects of LCA.

Products should normally be compared according to the function they provide rather than simply by their physical weight or number of units.

This is addressed through the concept of the functional unit.

Imagine comparing two types of flooring. One product has lower environmental impacts per square metre when it is manufactured but lasts ten years. Another requires more resources to produce but lasts thirty years.

Comparing one square metre of each product would not reflect the same level of service.

A more meaningful comparison could examine the environmental impact of providing one square metre of flooring over thirty years.

The same principle applies to batteries, vehicles, packaging, clothing, lighting, machinery and many other products.

A reusable bottle should not necessarily be compared with one disposable bottle. It may need to be compared with the number of disposable bottles required to deliver the same quantity of beverages over the reusable bottle's expected lifetime.

Defining the functional unit correctly is therefore critical.

Poorly designed comparisons can produce technically calculated but practically misleading results.

Data Quality Is Critical

LCA depends heavily on data.

Some information can be collected directly from suppliers and production facilities. Other information may come from life cycle inventory databases, industry datasets, scientific literature or recognised environmental models.

The quality of those inputs affects the reliability of the results.

Supplier-specific information about electricity consumption or material production may provide a more accurate picture than generic industry averages. But collecting primary data across complex supply chains can be difficult.

Companies therefore need to consider factors such as geographical relevance, technology, age of data, completeness and consistency.

This is particularly challenging for products involving global supply chains.

A material produced using renewable electricity in one country may have a substantially different climate footprint from the same material produced using a fossil-intensive electricity system elsewhere.

Transport modes can also matter. Electricity mixes change over time. Recycling rates vary between markets. Consumer behaviour can differ significantly.

An LCA result should therefore not be treated as a perfectly precise environmental score.

It is a model based on data, assumptions and methodological choices.

Transparency about those choices is essential.

Product Environmental Footprint in the European Union

The European Union has developed the Product Environmental Footprint, or PEF, as an LCA-based approach for measuring the environmental performance of products.

The methodology considers environmental impacts across the life cycle, from raw material extraction through manufacturing and use to end-of-life treatment.

One objective of the PEF approach is to improve consistency, reproducibility, and comparability in environmental assessments by providing more detailed methodological requirements.

The European Commission issued a Recommendation on the use of Environmental Footprint methods in 2021, covering both Product Environmental Footprint and Organisation Environmental Footprint approaches.

The Commission has continued to provide guidance and training around the PEF methodology, including resources intended to help non-specialist users understand how a study is structured, how data is collected and how results should be interpreted.

These developments reflect a wider trend.

Environmental information about products is becoming increasingly relevant to product policy, sustainable procurement, corporate reporting and environmental communication.

For companies selling products into regulated markets, the ability to generate reliable product-level environmental data is therefore becoming more strategically important.

LCA and Environmental Claims

Environmental marketing creates another important use case.

Terms such as "low carbon", "sustainable", "recycled", "eco-friendly" and "lower impact" increasingly attract scrutiny from consumers, regulators and business customers.

LCA cannot automatically prove every environmental claim, but it can provide a structured evidence base for claims relating to product impacts.

For example, if a company claims that a redesigned product has a lower environmental footprint than its predecessor, a properly designed comparative assessment can help determine whether the claim is supported by evidence.

This is particularly important because changing one product characteristic does not necessarily improve the product overall.

Removing plastic packaging might appear environmentally beneficial, but if the replacement increases product damage or food waste, the system-wide result could be worse.

Environmental claims therefore need clearly defined boundaries and appropriate evidence.

Life cycle thinking helps companies move away from isolated product attributes toward measurable environmental performance.

Procurement and Supply Chain Management

LCA is also becoming relevant beyond sustainability departments.

Procurement teams can use product-level environmental information when comparing suppliers.

A manufacturer seeking to reduce Scope 3 emissions, for example, may discover that purchased materials represent a major share of its footprint. Supplier-specific product carbon footprints or LCA information can help identify which materials, technologies or manufacturing locations contribute most heavily.

Procurement can then become part of the decarbonisation strategy.

Companies may incorporate environmental requirements into supplier selection, request primary environmental data, prioritise lower-impact materials or work with strategic suppliers to improve production processes.

The same information can support product development and risk management.

Materials associated with intensive energy use, water consumption or scarce resources may create both environmental and commercial vulnerabilities.

LCA therefore provides not only sustainability information but potentially useful intelligence about supply chain dependencies.

Limitations of Life Cycle Assessment

Despite its value, LCA has important limitations.

Results depend on the scope, system boundaries, assumptions, datasets and impact assessment methodology used.

Two studies examining similar products can sometimes produce different results because they use different assumptions.

Future product use is also difficult to predict.

How long will a product last? How frequently will it be used? How will consumers dispose of it? What electricity system will power it? How much material will actually be recycled?

These questions can materially affect results.

There is also a risk of false precision.

An LCA may produce numerical values with several decimal places, but this does not mean the underlying environmental system is known with the same precision.

Sensitivity and uncertainty analysis are therefore important, particularly when small differences between alternatives could change the conclusion.

LCA should be treated as a decision-support method rather than an absolute environmental truth.

Its greatest value often comes from understanding the scale and location of impacts and testing how different decisions affect them.

Practical Implications for Companies

Companies do not necessarily need to begin by assessing every product in their portfolio.

A more practical approach is to prioritise.

Businesses can start by identifying products with high sales volumes, carbon-intensive materials, significant energy consumption, regulatory exposure, or strategic importance.

A screening assessment can then help identify environmental hotspots.

Once these are understood, companies can ask more targeted questions:

• Which materials contribute most to the product's footprint?

• How important is manufacturing compared with product use?

• Would increasing product lifetime reduce overall impact?

• Can recycled or alternative materials provide meaningful improvements?

• How significant are transport emissions?

• What happens to the product at the end of its useful life?

• Which environmental impacts could increase when carbon emissions decrease?

• Where would better supplier data materially improve the assessment?

The answers can inform product design, procurement, supplier engagement and sustainability strategy.

Organisations should also establish clear governance around environmental data.

Product engineers, procurement teams, sustainability specialists and suppliers may all hold different parts of the information required for an LCA. Effective assessments therefore often require collaboration across functions rather than being conducted entirely within an ESG department.

Over time, companies can build product-level environmental data into normal decision-making processes.

The objective is not simply to produce more environmental reports.

It is to make better products.

Conclusion

Life Cycle Assessment provides companies with a structured way to understand environmental impacts across the full life of a product.

Its importance comes from perspective.

A factory-level assessment can show what happens inside a company's operations. A carbon footprint can show where greenhouse gas emissions occur. A recycling rate can show what proportion of material is recovered.

LCA connects these individual pieces into a wider product system.

By examining raw materials, manufacturing, transport, use and end-of-life together, companies can identify environmental hotspots, compare alternatives more fairly and reduce the risk of solving one problem while creating another.

This is particularly relevant as businesses pursue net-zero targets and circular economy strategies. Decarbonising products requires understanding where emissions are embedded. Circular products need evidence that reuse, recycling or longer lifetimes actually reduce environmental impacts. Environmental claims need credible supporting data.

LCA cannot eliminate uncertainty, and a study is only as strong as its methodology, assumptions and underlying data.

Used correctly, however, it provides something increasingly important in sustainability: a method for moving from assumptions about what appears environmentally preferable to evidence about where impacts occur and what changes can meaningfully reduce them.

For businesses designing the next generation of products, that difference matters.