The Power of Life Cycle Assessment: A Guide for Companies

A life cycle assessment (LCA) measures the environmental impact of a product across its entire life cycle, from raw material extraction to disposal. This guide covers the four phases of ISO 14040 and ISO 14044, the system boundary choice between cradle-to-gate, cradle-to-grave and cradle-to-cradle, and which EU disclosure each LCA result feeds.

What is a lifecycle assessment?

A lifecycle assessment (LCA) is a method for evaluating the environmental impact of a product, process or service over its entire lifecycle. This life cycle includes the extraction of raw materials, production, transportation, use, disposal and recycling. The life cycle inventory (LCI) analysis gathers detailed data on all inputs and outputs associated with each stage of the product's life cycle. In the life cycle impact assessment (LCIA), the focus shifts to evaluating the potential environmental impacts identified in the LCI.

The main objective of an LCA is to quantify and evaluate the environmental impacts in order to make informed decisions to reduce these impacts.

However, the focus of LCA is not limited to CO2, and companies can extend LCA to other impact categories such as ozone depletion, eutrophication, acidification, human toxicity, ecotoxicity, photochemical ozone creation, land use and resource depletion.

The product life cycle: cradle-to-gate, cradle-to-grave and cradle-to-cradle

Every LCA begins with a decision about where the product life cycle starts and ends. That system boundary decides what the result can be used for, and what it leaves out.

Cradle-to-gate stops at the factory. Some regulations specifically require assessments up to the factory gates or use a cradle to gate approach, focusing on the environmental impact up to the point the product leaves the factory. Use and disposal sit outside the boundary, so two products with comparable gate figures can diverge once the use phase is counted.

Cradle-to-grave covers the full chain. By taking a cradle-to-grave approach, from raw material extraction through production, use, and final disposal, LCA provides a comprehensive view of a product's environmental footprint.

Cradle-to-cradle changes the question from impact to design. Adopting a cradle to cradle approach ensures products are designed for reuse and recycling, supporting a circular economy by closing material cycles and replacing the traditional cradle-to-grave model.

Boundaries are also cut inside a nominally complete scope. The European standard EN 15978:2011 is widely used for building LCAs, and whole building LCAs include all materials in a building but are often limited to the materials with the largest quantities or impacts.

How an LCA is performed: the four phases of ISO 14040 and ISO 14044

The international standards ISO 14040 and ISO 14044 structure every life cycle assessment into four iterative phases. They define the principles and framework conditions for conducting an LCA and provide guidelines for data collection, evaluation and interpretation, and are covered in more depth in the guide to LCA methodologies and standards.

Before phase 1 starts, four things should be settled:

• Establish the functional unit and system boundaries.
• Determine which life cycle stages and impact categories will be included.
• Clarify the intended use of the results and the target audience.
• Use primary data where possible, supplemented by industry averages or databases for background processes.

The need for the availability of reliable data is fundamental. Databases such as Ecoinvent, which are both open use and accredited, allow information to be shared freely and enable life cycle inventory analysis for a variety of sustainability assessments. In specific sectors, aggregated data or sectoral averages are often used to estimate environmental impacts when primary data is unavailable.

Who needs an LCA, and what it delivers

An LCA is usually commissioned by companies that make a physical product and are asked about it: by a customer's procurement questionnaire, by a public buyer, or by their own product development. For companies, life cycle assessment is critical to understanding and reducing their environmental impact. By implementing LCA, companies can achieve their sustainability goals, optimize their processes and make their products more environmentally friendly.

• Lower costs: An LCA can provide data on inefficiencies, potentially leading to a reduction in energy or material consumption.
• Hotspots: Determine "hotspot" areas with significant environmental impacts along a product's lifecycle.
• Regulatory preparation: A lifecycle assessment can provide companies with insights into the impact of future regulations and the associated costs.

The limitations of an LCA should also be understood. The focus on environmental impacts often means that economic and social challenges are not addressed. Furthermore, while the LCA methodology evaluates potential and non-real environmental impacts, it evaluates global or regional rather than local environmental effects. This means that while LCA has recognized that emissions have a global impact, local or smaller impacts on ecosystems or human health are not identified. An LCA also does not replace a corporate footprint: for the difference between a product result and a company result, see the guide on LCA versus product carbon footprint.

From LCA result to EU disclosure: ESRS, EPD and PEF

These four phases increasingly feed mandatory disclosures. The EU Digital Product Passport, the Battery Regulation, the Product Environmental Footprint (PEF) method, and ESRS E5 on resource use and the circular economy all draw on life cycle assessment data, moving LCA from a voluntary exercise toward a compliance baseline.

Three data gaps stall most first product LCAs. Supplier primary data: suppliers answer with a catalogue, not a per-unit figure, so ask for one named process at a time and fall back to a background database where no answer arrives. Energy allocation per unit: meters sit on the site, not on the product line, so write the allocation rule down and apply it to every product the same way. End-of-life assumptions: nobody in the company owns them, so declare the scenario openly in the report instead of burying it in the model.

My position: a result that cannot name its data sources per phase is not a compliance asset, it is a slide.

Frequently Asked Questions (FAQ) about Life Cycle Assessment (LCA)

If you need assistance with a first product LCA, feel free to contact me for a consultation.