Life Cycle Assessment (LCA)

Life Cycle Assessment (LCA) is a standardised methodology that evaluates the environmental impacts associated with all stages of a product, process, or service, from raw material extraction (cradle) to end-of-life (grave). It provides the evidence base for eco-design, public policy, and corporate sustainability strategies.

The four phases of an LCA

1. Goal and scope definition: establishes the purpose, intended audience, functional unit, and system boundaries.
2. Life Cycle Inventory (LCI): compiles data on inputs (energy, materials) and outputs (emissions, waste).
3. Life Cycle Impact Assessment (LCIA): converts inventory data into impact categories such as climate change, acidification, and resource depletion using characterisation factors.
4. Interpretation: identifies hotspots, draws conclusions, and formulates recommendations for improvement.

Standards and frameworks

• ISO 14040: sets out the principles and framework for LCA.
• ISO 14044: defines the detailed requirements and guidelines.
• Product Environmental Footprint (PEF): the EU LCA-based method for environmental labelling and product comparison.
• Environmental Product Declarations (EPD): communicate verified, LCA-based environmental information.

Applications

• Eco-design: optimise materials and processes to reduce impact.
• Carbon footprinting: the Product Carbon Footprint is an LCA focused on greenhouse gas emissions.
• Public policy: evaluate waste management or energy system options.
• Comparative analysis: support evidence-based choices, for example between glass and recycled plastic packaging.

Advantages

• Holistic view: prevents shifting impacts between life cycle stages or impact categories.
• Evidence-based decisions: provides a scientific basis for investments, policy, and reporting.
• Credibility: promotes transparency and often includes external critical review.

Limitations

• Complexity and cost: typically requires specialised software (for example SimaPro, openLCA, or Sphera, formerly GaBi) and comprehensive databases.
• Uncertainty: incomplete or regionally averaged data can affect accuracy.
• Interpretation: expert judgement is needed to analyse and communicate results.

Trends

• Digitalisation: integration with real-time data and traceability tools.
• Dynamic LCA: accounts for changes over time, such as an evolving energy mix.
• Life Cycle Sustainability Assessment (LCSA): extends LCA to social and economic dimensions.

Life Cycle Assessment is the reference tool for quantifying environmental impacts comprehensively and a foundation for the transition to a circular economy. At Manglai we help companies measure their carbon footprint and prepare their sustainability reporting. Discover how Manglai can help you.