Life cycle assessment
Also searched as: LCA, life-cycle assessment, life cycle analysis, cradle to grave, cradle to gate, ISO 14040, ISO 14044, environmental footprint
A standardized method for quantifying the environmental impacts of a product across its life stages, from raw material extraction through production, use and disposal.
In detail
An LCA starts by defining its goal, scope and functional unit, such as one kilogram of spun yarn or one garment worn a given number of times. It then compiles a life cycle inventory of inputs and outputs, including energy, water, chemicals and emissions, within stated system boundaries. The impact assessment converts those flows into indicators such as climate change, water scarcity or eutrophication, and the interpretation phase examines uncertainty, sensitivity and limits. The international framework is set out in ISO 14040 and ISO 14044.
The science and numbers
Inventory data come from primary measurements or background databases, and allocation rules split burdens among co-products, such as lint and seed at the gin or wool and meat on a farm. Characterization multiplies each flow by a factor, such as a global warming potential, and sums results per impact category. A systematic review of textile LCAs found that production and use phases carry the largest share of impacts while end of life usually contributes little, and noted a paucity of studies comparing different fibers for the same functional unit. A review of reuse and recycling LCAs found results most sensitive to recycling yields, use-phase variables and assumptions about which virgin production is displaced, and found that practices extending service life gave the lowest impacts.
A practical example
Two studies compare cotton and polyester T-shirts and reach opposite conclusions. A student reading them should check the functional unit, whether use-phase washing is included, which regions' farming or electricity data were used, how co-products such as cottonseed were allocated, and which impact categories were reported. Different choices can legitimately produce different answers, which is why method disclosure matters.
What to distinguish
An LCA result is conditional on its boundaries, data and assumptions; it is not a single objective score for a fiber. Cradle-to-gate studies omit use and end of life, and many studies leave out biodiversity, microplastic release, animal welfare or social impacts. Comparative public claims deserve more scrutiny, including independent review, than internal screening studies.
Origins and history
According to a review in Environmental Science and Technology, life cycle work grew during the 1970s from energy analyses of products into comprehensive environmental burden analysis. Full impact assessment and life cycle costing models followed in the 1980s and 1990s, and social and consequential LCA gained ground in the 2000s. The ISO 14040 series gave practitioners a shared framework, and fashion-sector reviews now examine both the value and the limits of LCA for guiding company decisions.
Related terms
Sources & further reading
- Environmental Science and Technology: Life cycle assessment, past, present, and future (Guinee et al., 2010)
- Waste Management: Life cycle assessment to tackle the take-make-waste paradigm in textiles production (2022)
- Waste Management: Life cycle assessment applications to reuse, recycling and circular practices for textiles, a review (2024)
- Journal of Surgical Research: A life cycle assessment of reusable and disposable surgical caps (2024)
Technical references reviewed 2026-09-22. Examples are illustrative. Industry organizations and manufacturers describe their own fields; their references are not independent product endorsements. Figures are approximate and depend on the stated test conditions.