What life cycle assessments actually involve

A Life Cycle Assessment (LCA) is a systematic method for evaluating the environmental impacts of a product, service, or process across its entire life cycle, from raw material extraction through manufacturing, distribution, use, and end-of-life disposal or recycling. LCA quantifies impacts across multiple environmental categories including climate change (carbon footprint), water use, land use, resource depletion, and ecotoxicity. The methodology is standardised under ISO 14040 and 14044. LCAs are used to inform product design decisions, substantiate environmental claims, compare alternatives, and meet regulatory requirements including the EU Green Claims Directive and CSRD Scope 3 reporting.

Why it's harder in practice than it looks

Goal and scope definition determines whether the LCA is useful or misleading

The functional unit, the unit of performance against which all impacts are measured, and the system boundary, which life cycle stages are included, fundamentally determine the results. An LCA comparing a paper bag and a plastic bag that uses different functional units or system boundaries can produce opposite conclusions. Without rigorous goal and scope definition, LCA results cannot be meaningfully compared or communicated.

Primary data collection is resource-intensive and often resisted by suppliers

High-quality LCA requires primary data on energy use, material inputs, and waste outputs at each process stage. For upstream supply chain stages, this data must come from suppliers, many of whom do not collect it in the required format or are reluctant to share it. Most commissioned LCAs use background databases (ecoinvent, GaBi) for upstream stages, which introduces uncertainty that must be acknowledged in the results.

Comparative LCA claims require identical methodology and independent review

Comparative assertions, claims that one product has lower environmental impact than another, require a critical review by an independent panel under ISO 14044 before they can be published. Companies that commission an LCA and use comparative claims without this review are making unsubstantiated assertions that are legally exposed under green claims regulations.

LCA results are multidimensional and resist simple summarisation

A product may score well on carbon footprint and poorly on water use or land use. Summarising LCA results as a single environmental score requires a weighting methodology that introduces value judgements about the relative importance of different environmental impacts. Single scores are useful for some purposes but can obscure important trade-offs that product designers need to understand.

Translating LCA outputs into design decisions requires interdisciplinary collaboration

LCA results are only useful if product designers, procurement teams, and marketing teams understand them and can act on them. Many LCAs are commissioned and then sit unused because the organisational process for incorporating results into product development decisions has not been designed. The most valuable LCA programmes are integrated into product development cycles from the start.

What good looks like

A high-quality LCA is commissioned with a clearly documented goal and scope that matches the intended use, uses primary data for the highest-impact processes and verified background datasets for others, is conducted by a practitioner with ISO 14040/44 expertise, has results reviewed critically by an independent expert for comparative assertions, and produces outputs in a format that is actionable for the intended audience, whether that is a design team, a marketing function, or a regulatory disclosure. The LCA is part of a continuous improvement process rather than a one-time certification exercise.

When to bring in external support

LCA methodology expertise is specialist territory. Firms commissioning LCAs for the first time frequently underestimate the complexity of goal and scope definition, the challenge of data collection, and the interpretation challenges that emerge from multidimensional results. An experienced LCA practitioner reduces both the time and cost of producing a credible study.

Leafr's network includes ISO 14040/44-qualified LCA practitioners with sector experience across consumer goods, packaging, food and beverage, and manufacturing, including projects for major brands that needed LCA data to substantiate product claims and inform packaging redesign. Teams are typically matched within 48 hours.

Frequently asked questions

What is a life cycle assessment?

A life cycle assessment (LCA) is a standardised environmental analysis method that quantifies the inputs, outputs, and potential environmental impacts of a product or service across its entire life cycle, from raw material extraction through production, distribution, use, and end-of-life treatment. It is governed by ISO 14040 (principles and framework) and ISO 14044 (requirements and guidelines). LCA is used to inform design decisions, substantiate environmental claims, and meet regulatory disclosure requirements.

What is a carbon footprint study and how does it differ from a full LCA?

A product carbon footprint study (PCF) is a focused LCA that quantifies greenhouse gas emissions across a product's life cycle, typically expressed in kg CO2 equivalent per functional unit. It is faster and less expensive than a full multi-impact LCA but provides no information about other environmental impacts such as water use, land use, or toxicity. A full LCA covers all relevant impact categories. For companies making carbon-specific claims, a PCF aligned to ISO 14067 or the GHG Protocol Product Standard is sufficient; for broader environmental claims, a full LCA is required.

How long does an LCA take to complete?

A streamlined LCA using primarily background data can be completed in four to eight weeks. A detailed LCA with primary data collection from multiple supply chain tiers typically takes three to six months. An LCA requiring independent critical review for comparative assertions adds two to three months to the timeline. Scope and timeline should be agreed with the LCA practitioner at the outset based on the intended use of the results.

What is an LCA database and why does it matter?

LCA databases contain inventory data for thousands of materials, processes, and energy systems, providing background data for the upstream and downstream stages of a product's life cycle. The main databases are ecoinvent (Swiss), GaBi (German), and the US Life Cycle Inventory Database. Database choice affects results, and different databases cover different geographies and processes with different levels of detail. Results should note which database version was used, as datasets are updated over time and comparability between studies using different database versions requires care.

When is critical review required for an LCA?

ISO 14044 requires an independent critical review before an LCA is used to make comparative assertions intended for public communication, claims that one product has a lower environmental impact than another. The review must be conducted by an independent expert or panel not involved in the study. Critical review adds cost and time but is mandatory for legally substantiated comparative claims, and failure to conduct it leaves companies exposed under green claims regulation.

How do companies use LCA data in product design?

LCA data is most valuable when it identifies the hotspots in a product's life cycle, the stages and materials that contribute most to environmental impact, and quantifies the impact reduction potential of specific design changes. This allows design teams to prioritise changes by environmental effectiveness rather than by intuition. The most effective programmes embed LCA screening into early-stage design reviews so environmental performance is a design criterion from the outset rather than an afterthought assessed after the product is fixed.

What regulations reference LCA methodology?

The EU Green Claims Directive requires environmental claims to be substantiated by scientific evidence consistent with ISO 14040/44 where the claim relates to life cycle environmental performance. The EU Ecodesign for Sustainable Products Regulation references LCA methodology for setting product environmental requirements. CSRD Scope 3 reporting benefits from LCA data for product-related categories. The UK's PAS 2050 standard for product carbon footprinting is aligned with ISO 14067 and used by companies disclosing Scope 3 Category 11 emissions.