Research libraryCarbon per Garment
Chapter 03 of 14 · Part I · Draft web edition
The same inventory can support a sourcing decision or mislead the public, depending on the function and boundary chosen.
The cloth is woven from this chapter's 4 exhibits: each weft is one exhibit's own data, normalised; each warp group is a section. The probe reads the exhibit's own value where it crosses. Procedural visualisation, not a measurement.
Read-out
Sourced from Forfora et al. (2026) comparative T-shirt life cycle assessment (S31). The baseline constant-mass scenario assigns 250 g per T-shirt to all four fibres; the equivalent-strength scenario adjusts garment mass for mechanical tenacity to 250 g for cotton, 115 g for polyester, 153 g for Lyocell and 250 g for viscose.
Unit: grams per T-shirt. Status: sourced. Sources: S31.
Overture · 1 min
A product carbon footprint has no independent meaning until its functional unit and system boundary are fixed to match the decision at hand.[S01][S24] The same set of metered factory utilities, agricultural inputs and transport records can support a valid procurement comparison, distort a fibre substitution choice or mislead a retail buyer if the denominator shifts without disclosure.[S22][S26] In apparel accounting, three product-level units and one organisational denominator appear repeatedly: a kilogram of processed fibre or fabric for mill engineering, a finished garment at the factory gate for business-to-business exchange, a single wear event across a defined service life for consumer and design comparisons, and annual corporate output for site intensity tracking.[S23][S26][S31][S0301] Treating these four denominators as interchangeable is a primary source of false rankings in textile sustainability work.[S26][S31] When a cotton shirt and a cellulosic or synthetic shirt are compared per kilogram of fabric, the result reflects process intensity per unit of mass; when they are compared at equivalent mechanical tenacity or per wear across a verified service life, required garment mass and downstream care change the calculation and can reverse the apparent ordering of materials.[S26][S31][S0302] Green Future Tech Limited (GFT) therefore establishes a strict scoping rule for its Cameroon textile programme: every footprint calculation must lock its intended application, functional unit, system boundary and allocation rule before activity data are aggregated, and no partial factory-gate metric may be published as a complete garment claim.[S01][S06][S24]
3.1
Related · chapter 016 paragraphs step it
Read-out
Sourced process synthesis. S04 governs the corporate inventory, S02 its upstream and downstream Scope 3 coverage, S01 the product life cycle account, and S23 the calculation methods and evidence descriptions. Reconciliation compares shared activities, periods and boundaries; it does not assert that corporate and product totals are interchangeable.
Unit: accounting architecture. Status: sourced. Sources: S01, S02, S04, S23.
Read this exhibit in its chapter ↗An inventory of greenhouse gas flows does not organise itself; the engineering question being asked dictates which unit processes enter the system boundary, which reference flow normalises the inputs and which downstream assumptions are permissible.[S01][S24] In ISO 14040:2006, the intended application of a life cycle assessment (LCA) or life cycle inventory (LCI) study is defined during the initial goal and scope phase rather than appended after calculations are complete.[S24] A mill manager in northern Cameroon evaluating whether to upgrade a boiler or reduce yarn waste needs a process boundary centred on spinning, knitting or wet processing per kilogram of accepted output.[R03][S23][S31] A brand buyer comparing two cut, make and trim suppliers needs a cradle-to-gate product record anchored to a specified garment style, mass and bill of materials.[S10][S23] A regulator or consumer evaluating a public marketing claim needs a full cradle-to-grave account that includes distribution, consumer laundering, service life and end-of-life treatment.[S06][S32][S0301] When an organisation uses a boundary designed for one goal to answer a different question, the arithmetic may remain internally consistent while the conclusion becomes invalid.[S22][S24]
Goal definition in ISO 14040 requires the practitioner to state the reasons for carrying out the study, the intended audience and whether the results will be used in comparative assertions disclosed to the public.[S24] Each declaration alters the technical specification of the model.[S24][S25] An internal screening model built to rank emissions hotspots inside a single factory can rely on secondary background databases such as ecoinvent for non-core inputs, provided those proxies are logged for later replacement.[S16][S23] By contrast, a study intended to support a public claim that one garment has a lower carbon footprint than a competing garment triggers strict requirements under ISO 14044:2006, the GHG Protocol Product Standard and European Union consumer law, including equivalent boundaries, validated functional performance, uncertainty analysis and critical review.[S01][S25][S32]
For Cameroon's cotton-to-garment value chain, separating internal engineering baselines from external comparative claims prevents premature disclosure.[R06][S24] Sector evidence indicates that approximately 95 percent of Cameroonian cotton fibre is exported raw while about 5 percent is processed locally, against a national industrialisation target of 50 percent local processing by 2030.[R06][R07] New industrial projects, such as the announced Camtext SA integrated venture targeting 12,000 tonnes a year of processed cotton, alongside restructuring plans for existing domestic mills, aim to build local spinning, weaving, dyeing and garment assembly capacity.[R08][R09][R10] During construction and ramp-up, the primary purpose of carbon accounting is operational control: establishing metered baselines for electricity, thermal energy, material yield and chemical consumption as lines enter service.[S20][S23] Rushing to publish a headline footprint per garment from generic global averages before site meters and product specifications are stable serves neither factory engineering nor credible market positioning.[S16][S22][S23]
Standards also draw a firm boundary between a life cycle inventory, a single-issue carbon footprint and a multi-indicator life cycle assessment.[S05][S25] ISO 14044:2006 covers both LCA studies and LCI studies, recognising that an inventory of physical flows (kilograms of nitrogen fertiliser, kilowatt-hours of electricity, cubic metres of water and kilograms of solid waste) is a technical dataset that precedes impact characterisation.[S25] ISO 14067:2018 specifies requirements and guidelines for quantifying and reporting the carbon footprint of a product, while explicitly stating that the standard addresses only a single impact category: climate change.[S05]
This distinction carries major operational consequences in textile production, where trade-offs between climate change, water scarcity, ecotoxicity and plastic persistence are structural.[S31][S0302] In the April 2026 comparative T-shirt LCA by Forfora et al., which evaluated viscose, Lyocell, cotton and polyester T-shirts across spinning, knitting, wet processing and assembly under consistent boundaries, cotton T-shirts produced in the China baseline scenario exhibited the lowest global warming potential at 14.1 kg CO2eq per kilogram of shirt, but recorded the highest water demand at 2.9 cubic metres per kilogram.[S31][S0302] In the same study, polyester garments required less water but contributed 1.0 kg of persistent plastic accumulation per kilogram of shirt compared with 0.1 kg per kilogram for cellulose-based fibres.[S0302] Within man-made cellulosic fibres, closed-loop solvent recovery enabled Lyocell to reduce freshwater ecotoxicity by 35 percent and human non-carcinogenic toxicity by 62 percent relative to viscose, yet Lyocell registered the highest carbon footprint at 21.6 kg CO2eq per kilogram unless manufactured in regions with cleaner energy mixes.[S31][S0302]
Because ISO 14067 isolates climate change, a low product carbon footprint can never be presented as proof of low overall environmental impact.[S05][S0301] The European Union Product Environmental Footprint Category Rules (PEFCR) for Apparel and Footwear reinforce this rule by prohibiting brands from communicating a single aggregated score to consumers and requiring disclosure across at least four specific impact categories, including climate change and water use.[S06][S0301] In GFT's performance-management design, the carbon account sits alongside water intake per unit, effluent quality, chemical consumption and solid waste generation as one governed metric within a broader operational record.[S05][S25]
3.4
Cotton (250 g constant)
Cotton (250 g constant): 3.5 kg CO2e per T-shirt (cradle-to-gate) · derived
Once the study goal and impact scope are declared, the practitioner must define the functional unit : the quantified performance of a product system for use as a reference unit.
Lyocell (250 g constant)
Lyocell (250 g constant): 5.4 kg CO2e per T-shirt (cradle-to-gate) · derived
Cotton (250 g tenacity)
Cotton (250 g tenacity): 3.5 kg CO2e per T-shirt (cradle-to-gate) · derived
Lyocell (153 g tenacity)
Lyocell (153 g tenacity): 3.3 kg CO2e per T-shirt (cradle-to-gate) · derived
The method behind it: Worked example.
Derived by GFT from Forfora et al. (2026) China baseline global warming potentials of 14.1 kg CO2eq/kg for cotton (S0302) and 21.6 kg CO2eq/kg for Lyocell (S31, S0302), multiplied by the constant-mass (0.250 kg) and equivalent-tenacity (0.250 kg cotton, 0.153 kg Lyocell) garment masses reported in S31. Values rounded to two decimal places.
Unit: kg CO2e per T-shirt (cradle-to-gate). Status: derived. Sources: S31, S0302.
3.4 · the bodyExhibit 13 above; its figures are illustrative where marked.
Once the study goal and impact scope are declared, the practitioner must define the functional unit: the quantified performance of a product system for use as a reference unit.[S01][S24] A review of methodological choices in LCA-based textile and apparel rating tools by Watson and Wiedemann demonstrates that clothing assessments routinely confuse reference flows of raw material mass with functional units of garment service.[S26] Comparing one kilogram of scoured cotton yarn with one kilogram of polyester filament measures an intermediate industrial output, not the function experienced by a wearer.[S26][S31] Conversely, dividing a company's annual Scope 1, Scope 2 and Scope 3 emissions by the total number of garments shipped in a year creates an organisational intensity ratio across a shifting product mix, which cannot represent the physical footprint of any individual garment.[S04][S23]
To prevent denominator drift across engineering, commercial and board reporting, Exhibit 11 sets out the three product functional units used in textile life cycle work alongside the corporate output denominator used in organisational intensity reporting.[S23][S26][S31][S0301]
As Exhibit 11 establishes, each denominator is valid within its own domain and misleading outside it.[S23][S26] First, one kilogram of processed fibre, yarn or fabric is the natural denominator for ginning, spinning, knitting, weaving and wet processing, where machine energy scales with substrate mass and moisture.[S26][S31] However, one kilogram of fabric cannot establish which fibre produces a lower-carbon garment, because different fibres possess different mechanical strengths and densities, and are knitted or woven to different areal weights to achieve equivalent performance.[S26][S31]
Second, one finished garment of a specified style, size and technical specification is the commercial unit of exchange between a garment factory and an apparel buyer.[S10][S23] Moving from a kilogram of fabric to a finished garment introduces cutting efficiency, marker fallout, sewing loss, trims, packaging and first-pass quality yield.[S23][S31] Yet a per-garment denominator at the factory gate still stops short of consumer service if two shirts require different washing temperatures, drying energy or replacement frequencies during use.[S12][S26][S30]
Third, one wear (or one defined use cycle, including the associated fraction of laundering and repair) represents the functional service of clothing.[S26][S0301] Under the EU Apparel and Footwear PEFCR published in 2025, the functional unit is defined as one use of the garment, accounting for typical lifespan and number of washes based on product type.[S06][S0301] This service-based denominator connects physical quality directly to environmental accounting, but requires standardised or empirically verified use-phase and durability parameters.[S26][S0301]
Fourth, annual accepted corporate output serves as the physical denominator for an organisational intensity metric under the GHG Protocol Corporate Standard and Scope 3 guidance.[S04][S23] Dividing monthly factory emissions by accepted pieces provides a useful shift management indicator when product mix is controlled, but cannot substitute for a product LCA because shifting the order book from lightweight shirts to heavy trousers raises emissions per piece even when machines run more efficiently.[S04][S23]
Moving from a mass-based reference flow to a function-based garment specification can cut the required material mass of high-tenacity fibres by more than half and invert comparative carbon rankings.[S31] Most published textile LCAs assume a constant garment mass across all fibres, such as a 250-gram T-shirt, implicitly treating one gram of weak fibre and one gram of strong fibre as functionally equal.[S26][S31]
To test how mechanical performance alters the functional unit, Forfora et al. (2026) evaluated an equivalent-strength scenario alongside their baseline constant-mass scenario.[S31] Using tensile strength and tenacity relationships for each fibre and yarn system, they calculated the garment mass required for each T-shirt to withstand the same mechanical force as a 250-gram cotton reference shirt.[S31] Exhibit 12 displays the resulting shift in required garment mass across the four fibres.[S31]
As Exhibit 12 illustrates, holding mechanical strength constant leaves cotton and viscose at 250 grams per T-shirt, reduces Lyocell from 250 grams to 153 grams (a 38.8 percent reduction in required garment mass, derived as 97 grams divided by 250 grams), and reduces polyester from 250 grams to 115 grams (a 54.0 percent reduction in required garment mass, derived as 135 grams divided by 250 grams).[S31] While Exhibit 12 establishes the physical mass sensitivity to tenacity under the authors' mechanical equivalence model, it cannot prove that buyers will always specify a 115-gram polyester shirt or a 153-gram Lyocell shirt in place of a 250-gram cotton jersey, because opacity, hand and thermal comfort also govern commercial garment weight.[S26][S31]
holding mechanical strength constant leaves cotton and viscose at 250 grams per T-shirt
S31
Nevertheless, when mechanical strength is the governing functional requirement, scaling the per-kilogram inventory by the tenacity-adjusted garment mass reverses the carbon ranking between cotton and Lyocell in the study's baseline production geography.[S31][S0302] Exhibit 13 demonstrates this derived arithmetic using the published China baseline cradle-to-gate carbon intensities for cotton (14.1 kg CO2eq per kilogram) and Lyocell (21.6 kg CO2eq per kilogram).[S31][S0302]
The arithmetic behind Exhibit 13 shows why functional equivalence can matter more than small differences in background emission factors.[S31][S0302] Under a constant 250-gram mass basis, a Lyocell T-shirt carries 5.40 kg CO2e against 3.53 kg CO2e for cotton, making Lyocell appear 53.2 percent more carbon-intensive per shirt.[S31][S0302] Under the equivalent-tenacity functional unit, the 153-gram Lyocell shirt carries 3.30 kg CO2e against 3.53 kg CO2e for the 250-gram cotton shirt, making Lyocell 6.3 percent lower in carbon per garment before accounting for regional renewable energy options.[S31][S0302] What Exhibit 13 cannot establish is a universal preference for Lyocell over cotton, because the study's Monte Carlo uncertainty distributions overlap and the result depends on both regional energy mixes and whether a lighter fabric satisfies the garment's optical and tactile brief.[S26][S31]
3.7
A functional unit cannot be interpreted without its accompanying system boundary.[S01][S24] Across apparel supply chains, two system boundaries perform distinct roles: cradle-to-gate (covering raw material extraction and processing up to the point where an intermediate textile or finished garment leaves the supplier's facility) and cradle-to-grave (covering the full product life cycle from extraction through manufacturing, logistics, storage, consumer use and final disposal or recovery).[S01][S23] Confusing a cradle-to-gate supplier certificate with a complete product footprint omits downstream stages that can account for 14 to 24 percent or more of total lifecycle emissions, depending on garment type and care regime.[S12][S23][S30]
For an upstream spinner, weaver, dyer or cut, make and trim manufacturer, a cradle-to-gate boundary is the only boundary over which the operator exercises direct measurement and operational control.[S10][S23] Under the GHG Protocol Technical Guidance for Calculating Scope 3 Emissions and the WBCSD PACT Methodology Version 3, supplier-specific product carbon footprints are exchanged as cradle-to-gate modules.[S10][S23] When a garment factory in Cameroon purchases dyed fabric or sewing thread, or when an international brand purchases finished garments from that factory, the buyer requires the cradle-to-gate emissions per unit of purchased product to populate Scope 3 Category 1 (Purchased goods and services) without double counting downstream transport or consumer use that the buyer models separately.[S02][S10][S23]
A modular cradle-to-gate boundary also protects data integrity.[S10][S23] A spinning and weaving mill can meter its kilowatt-hours of electricity, litres of boiler fuel, kilograms of starch and dyes, bale weights of ginned lint and kilograms of yarn and fabric waste.[S20][S23] It has no empirical visibility into whether the eventual retail customer washes the resulting shirt at 30 degrees Celsius or 60 degrees Celsius, dries it on an outdoor line in Douala or in an electric tumble dryer in Frankfurt, or discards it after 20 wears or 100 wears.[S12][S23][S30] Requiring an upstream supplier to embed speculative downstream consumer scenarios inside its business-to-business footprint would contaminate verified operational data with unverified scenario assumptions.[S10][S23]
While cradle-to-gate footprints are right for business-to-business data exchange, they are insufficient for unqualified public claims about a finished garment's environmental impact.[S01][S06][S32] Both the GHG Protocol Product Standard and the EU Apparel and Footwear PEFCR define product life cycle accounting across the entire chain from raw material extraction, manufacturing and logistics to consumer use and end-of-life.[S01][S06][S0301] Exhibit 14 illustrates how a supplier's cradle-to-gate handover record must be linked to downstream distribution, consumer care and end-of-life modules before a full cradle-to-grave garment footprint exists.[S01][S06][S23][S0301]
Read-out
Process and boundary architecture linking an upstream cradle-to-gate supplier record to the downstream distribution, use and end-of-life stages required for full life cycle assessment under GHG Protocol (S01, S23) and EU Apparel PEFCR rules (S06, S0301).
Unit: life cycle boundary stages. Status: sourced. Sources: S01, S06, S23, S0301.
As Exhibit 14 makes visible, the factory gate (cmt) is a handover node, not the end of the product system.[S01][S23] Up to the garment gate, the inventory can progressively replace secondary proxies with primary metered activity data from the farm, gin, mill and sewing floor.[S10][S23] Beyond the garment gate, the footprint relies on distribution logistics records and standardised or empirical scenarios for consumer care (care) and end-of-life (eol).[S06][S23][S0301] While Exhibit 14 defines the structural linkage between upstream and downstream modules, it does not fix the percentage share of emissions in each module, because those shares shift with garment care labels, climate zones and domestic appliance mixes.[S12][S30]
When an organisation publishes a partial footprint (such as a cradle-to-gate figure for a cotton T-shirt), standards require that the boundary restriction be named explicitly in the headline description and methodology note, and never implied to represent the complete life cycle.[S01][S05][S32] Omitting the use phase silently can bias comparisons between fibres requiring different laundering regimes, such as garments requiring hot washing and ironing versus garments washed cold and line-dried.[S12][S26]
Interlude · the cloth half-woven
Woven: sections 3.0 to 3.7Still to weave: 3.10 to 3.16
Read-out
Sourced synthesis of full life cycle coverage in S01, the single climate impact category in S05, greenhouse gas metric assessment in S11, and activity data, emission factor and GWP disclosure in S23. The five fields are an organising device, not an additional reporting standard.
Unit: required accounting declarations. Status: sourced. Sources: S01, S05, S11, S23.
Read this exhibit in its chapter ↗3.10
If the purpose of clothing is to provide wearable service over time, then the physical durability and functional longevity of a garment directly govern its environmental footprint per unit of service.[S26][S30][S0301] A garment that loses dimensional stability, pills severely, tears at the seams or fades after ten wash cycles forces an early replacement purchase, multiplying the agricultural, spinning, dyeing and assembly burdens required to clothe a person over a year.[S30][S0301] Conversely, extending the active service life of a garment distributes its embodied production carbon across a larger denominator of wears and, when it displaces the purchase of a new replacement garment, reduces absolute production emissions.[S12][S27][S30]
Sector-wide assessments show both why production dominates total textile emissions and why the use phase and service duration remain decisive levers.[S12][S30] In a European consumption model published by the European Environment Agency (2022), approximately 80 percent of the total climate change impact of textiles consumed in Europe occurs in the production phase, 3 percent in distribution and retail, 14 percent in the use phase (washing, drying and ironing) and 3 percent at end-of-life.[S30] In another sector life cycle assessment carried out on behalf of the United Nations Environment Programme with a 2016 baseline year, the use phase was estimated to account for 24 percent of the fashion sector's greenhouse gas emissions.[S12] The difference between a 14 percent use-phase share and a 24 percent use-phase share reflects differing geographic assumptions about household electricity grids, washing temperatures, tumble-dryer penetration and average wears per garment lifecycle.[S12][S26][S30]
When the functional unit is defined as one wear of a garment over W total wears during its useful life, the cradle-to-grave carbon footprint per wear is the sum of two terms: the embodied production, distribution and end-of-life emissions divided by W, plus the per-wear care and maintenance emissions multiplied by the washing frequency per wear.[S26][S30][S0301] Because embodied emissions are divided by W while per-wear care emissions remain roughly constant under a steady care regime, doubling the number of wears from W to 2W cuts the embodied production burden per wear in half.[S12][S26][S30]
However, two strict conditions govern whether a lower footprint per wear translates into a real reduction in atmospheric greenhouse gases.[S26][S27][S30] First, the additional wears must represent real utilisation that displaces the production and purchase of a new garment, rather than an idle garment hanging unused in a wardrobe.[S27][S30] Second, the heavier or more durable construction used to achieve longer life must not add more embodied carbon at the factory gate than it saves through avoided replacement over the actual period of consumer use.[S26][S30]
Because dividing a garment's footprint by a larger number of wears immediately lowers its reported impact per use, durability multipliers are an obvious target for manipulation if left unverified.[S26][S32] A manufacturer or brand cannot simply assume that its T-shirt will be worn 90 times while a competitor's T-shirt is worn 45 times without empirical physical testing and standardised category rules.[S26][S32][S0301]
In their review of textile and apparel LCA rating tools, Watson and Wiedemann highlighted that early rating tools either ignored garment service life completely or lacked standardised physical testing protocols to link fabric construction to expected lifespan.[S26] The 2025 EU Apparel and Footwear PEFCR addresses this vulnerability by requiring garments to be assessed for intrinsic durability (including standardised laboratory tests for material strength, colour fastness, dimensional stability and pilling resistance) as well as repairability factors (spare parts availability, serviceability and repair cost ratio) before any adjustment to the reference number of uses is permitted.[S06][S0301]
Furthermore, Directive (EU) 2024/825 on consumer protection for the green transition regulates sustainability and durability claims under European consumer law, requiring that environmental claims be substantiated by actual lifecycle evidence and prohibiting unverified assertions about a product's longevity or environmental superiority.[S32] In GFT's performance-management architecture, laboratory quality metrics (fabric weight, shrinkage, colour fastness, seam strength and defect detection rates) are not merely commercial acceptance checks; they are the primary physical evidence required to defend the denominator of a per-wear product carbon footprint.[R29][S26][S0301]
Protocol for selecting and locking the functional unit in GFT product studies
W) equal across compared garments unless laboratory physical test results under a recognised product category rule (such as the EU Apparel PEFCR intrinsic durability protocol) justify a differentiated service life.[S26][S32][S0301]3.13
Read-out
Decision matrix synthesised from sensitivity findings in Textile Exchange (S22), Watson and Wiedemann (S26) and Forfora et al. (S31). The horizontal axis scores sensitivity to boundary, co-product allocation (cottonseed vs lint) and processing loss (31% for cotton in S31). The vertical axis scores sensitivity to regional energy mix (up to 38% GWP shift in S31) and functional mass equivalence (115 g to 250 g in S31). Scores (0 to 10) guide evidence priority and are not emission factors.
Unit: structured evidence index (0 to 10). Status: sourced. Sources: S22, S26, S31.
Read this exhibit in its chapter ↗3.13 · Introduction
Fixing the functional unit and the downstream boundary still leaves a major structural choice inside the upstream boundary: how to partition burdens when a single production process yields more than one valuable output…
Exhibit 57, chapter 12: Conventional cotton
3.14 · Multi-output ginning and processing require explicit partitioning rules
Consider the first industrial stage of the cotton value chain: ginning seed cotton.
Exhibit 57, chapter 12: Conventional cotton
3.15 · Attributional accounting and consequential displacement cannot be blended silently
Beyond partitioning between co-products, scoping must distinguish between attributional accounting (which assigns a normative share of historical or current supply-chain emissions to a functional unit ) and consequential modelling (which estimates how global emissions change in response to a specific…
Exhibit 57, chapter 12: Polyester filament
3.13 · the bodyThe film above follows these sub-steps.
Fixing the functional unit and the downstream boundary still leaves a major structural choice inside the upstream boundary: how to partition burdens when a single production process yields more than one valuable output, and whether the study describes an average physical share of existing burdens (attributional accounting) or the system-wide effect of a change in demand (consequential modelling).[S01][S25][S26] In cotton and cellulosic apparel chains, co-product allocation and counterfactual assumptions can alter the calculated footprint per kilogram of fibre by tens of percent before a single bale reaches the spinning mill.[S26][S31]
Consider the first industrial stage of the cotton value chain: ginning seed cotton.[R03][S26] In northern Cameroon, SODECOTON supports more than 220,000 cotton producers and operates nine ginning plants alongside two cottonseed oil mills.[R03] When seed cotton enters a gin, it does not produce cotton lint alone; it separates the harvest into cotton lint (destined for spinning into yarn), cottonseed (destined for crushing into edible cottonseed oil, livestock meal and hulls) and gin trash or linters.[R03][S26] Across cultivation and ginning, all agricultural inputs (synthetic nitrogen fertiliser, pesticides, tractor fuel, field nitrous oxide emissions and gin electricity) jointly produce both the lint and the seed.[S26][S29]
ISO 14044:2006 and the GHG Protocol Product Standard establish a hierarchy for handling multi-functional processes: first, avoid allocation where possible by dividing the unit process into sub-processes or expanding the product system; second, where allocation cannot be avoided, partition the inputs and outputs between the products in a way that reflects the underlying physical relationships between them; third, where physical relationships alone cannot be established or used, allocate inputs and outputs in proportion to the economic value of the products.[S01][S25]
In cotton accounting, the choice between mass allocation and economic allocation is decisive.[S26] By physical mass, cottonseed outweighs cotton lint in harvested seed cotton, whereas by market value, cotton lint commands a higher price per kilogram than cottonseed and generates the majority of crop revenue.[S26] Consequently, allocating cultivation and ginning emissions by physical mass shifts the majority of farm fertiliser and soil nitrous oxide burdens onto cottonseed oil and livestock meal, making cotton lint appear artificially low in carbon, whereas economic allocation assigns the dominant share of farm emissions to cotton lint.[S26][S31]
The same partitioning challenge recurs in downstream processing and across competing fibres.[S26][S31] Combing cotton yarn removes short fibres (comber noils) sold as a co-product into nonwovens or open-end spinning; forest pulping for viscose and Lyocell co-produces tall oil, turpentine, lignosulphonates and bio-energy alongside dissolving wood pulp; petrochemical refining co-produces paraxylene and monoethylene glycol alongside fuel and chemical fractions.[S26][S31] In the 2026 comparative T-shirt LCA by Forfora et al., the authors tested sensitivity to economic partitioning alongside mass-based and tenacity-based functional units, confirming that allocation rules and co-product pricing must be declared alongside every published footprint.[S31]
Beyond partitioning between co-products, scoping must distinguish between attributional accounting (which assigns a normative share of historical or current supply-chain emissions to a functional unit) and consequential modelling (which estimates how global emissions change in response to a specific intervention or purchasing decision, including market substitution effects).[S26] Both Corporate Scope 3 inventories and standard Product Carbon Footprints under ISO 14067, PACT Version 3 and the EU Apparel PEFCR are primarily attributional accounts.[S05][S06][S10][S23] They sum the emissions occurring within the defined product system boundary and divide by the functional unit, without subtracting speculative credits for what might happen in external markets.[S01][S26]
To keep the accounting transparent, GFT separates the attributional product account from consequential decision scenarios.[S01][S26] In the attributional account, cotton lint and cottonseed are partitioned using a documented economic allocation baseline (with physical mass allocation retained in sensitivity tables so users can inspect the difference when SODECOTON lint and cottonseed oil prices fluctuate), and zero external displacement credits or carbon offsets are deducted from the product footprint.[R03][S26][S32] Consequential questions (such as how processing 50 percent of Cameroon's cotton locally by 2030 alters net shipping corridors, domestic cottonseed meal supply or regional grid dispatch) are evaluated in dedicated scenario models where counterfactual assumptions are explicit and auditable.[R06][R07][S26]
3.16
Related · chapter 138 paragraphs step it
Read-out
Derived arithmetic walkthrough using the 0.25 kg cotton T-shirt reference mass and 31 percent cumulative cotton loss from S31 (implying 0.362 kg input lint), combined with illustrative adjustments for unallocated utility meters, well-to-tank freight omissions (S18) and first-pass yield losses under PACT (S10) and Scope 3 (S23) rules. Values illustrate reconciliation mechanics, not a measured GFT factory result.
Unit: kg CO2e per shirt. Status: derived. Sources: S10, S18, S23, S31.
Read this exhibit in its chapter ↗The ultimate test of goal and scope definition arrives when two numbers are placed side by side to support a commercial or policy comparison.[S24][S25] Across the apparel industry, buyers and commentators frequently assemble tables comparing a cotton figure taken from one published report, a polyester figure taken from a supplier declaration, and a viscose or recycled-fibre figure taken from a third database, then rank the fibres from best to worst.[S22][S26] Textile Exchange explicitly warns against this practice, noting that results from LCA studies are highly sensitive to methodological choices, assumptions and boundaries, and cannot be compared directly unless those underlying conditions are aligned.[S22]
When two textile LCA studies produce different carbon numbers for what appears to be the same garment, the divergence often stems from incompatible scoping rules rather than genuine physical differences on the factory floor.[S22][S26] Drawing on the methodological review by Watson and Wiedemann (2019), Textile Exchange guidance (2026) and the comparative modelling in Forfora et al. (2026), six scoping mismatches routinely invalidate cross-study rankings:[S22][S26][S31]
0.250 / 0.69 = 0.3623 kg).[S31] Comparing a study that compounds stage-by-stage yield losses with a study that multiplies raw fibre intensity by finished garment weight alone introduces an immediate 31 percent downward bias.[S31]Because any one of these six discrepancies can shift a calculated garment footprint by 20 to 50 percent, ISO 14044:2006 mandates that comparative assertions intended for public disclosure undergo a critical review by a panel of independent experts to verify that system boundaries, data quality, allocation rules and impact assessment methods are equivalent across all compared product systems.[S25][S26] Similarly, the European Union's Apparel and Footwear PEFCR and Directive (EU) 2024/825 establish harmonised product category rules and legal disclosure requirements so that companies making comparative claims evaluate all products under identical rules rather than cherry-picking favourable boundaries.[S06][S32][S0301]
In an industrial programme, methodological consistency cannot be retrofitted at the end of the year by a consultant; it must be built into the factory's chart of accounts and production logs from the first shift.[S10][S23] Global fibre production rose from 125 million tonnes in 2023 to 132 million tonnes in 2024 according to Textile Exchange's Materials Market Report 2025, underscoring why apparel manufacturers face intensifying scrutiny from buyers and regulators to prove both absolute emissions discipline and verifiable product-level footprints.[S07][S21]
Within GFT's Cameroon textile programme, the scoping rules established in this chapter directly govern how production data and resource meters are joined in the digital architecture:[S10][S23]
cradle-to-gate or cradle-to-grave), functional unit (1 kg, 1 garment or 1 wear), ginning and mill co-product allocation method (economic or physical), cumulative loss factor and primary-data share.[S10][S23][S26]By locking the goal, scope, functional unit, boundary and co-product rules before aggregating activity data, the factory prevents its resource-efficiency metrics (kilowatt-hours per unit, cubic metres of water per unit and first-pass quality yield) from being misread as complete lifecycle footprints, while laying an auditable foundation for chapters that follow on data quality, field-to-lint cotton accounting, wet-processing energy, factory Scopes 1 and 2, logistics and consumer use.[S01][S23][S24]
Check the record
Every knot is a source this chapter cites; select one to read its record, or filter the register by grade. Publication dates and inherited-source limits stay explicit. Read the paper's full evidence summary.
31 sources · 371 citation marks on this pageMost cited: S26, 60 times
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All 31 records shown
R03 · Grade C · inherited record
Inherited evidence R03
Company profile: more than 220,000 cotton producers supported in northern Cameroon; nine ginning plants; two oil mills.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R06 · Grade C · inherited record
Inherited evidence R06
About 95 percent of cotton fibre exported raw against 5 percent processed locally; industrialisation target of 50 percent local processing.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R07 · Grade C · inherited record
Inherited evidence R07
SND30 restates the 50 percent local-processing target by 2030.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R08 · Grade C · inherited record
Inherited evidence R08
Announced SODECOTON and CICAM merger to create a cotton-textile industrial pole targeted by 2030.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R09 · Grade C · inherited record
Inherited evidence R09
Camtext SA integrated cotton-to-textile project, US$300 million (180 billion XAF); Panafritex and Arise with SODECOTON, CNPS and Marlo; 12 November 2025.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R10 · Grade C · inherited record
Inherited evidence R10
Camtext SA: 12,000 t a year processed; about 12,000 jobs at the Dibamba hub and 3,000 at Garoua; return on investment near 11 years; optimal capacity around 2033.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
R29 · Grade C · inherited record
Inherited evidence R29
Manual defect inspection 60 to 70 percent accurate, missing 20 to 30 percent of defects; computer vision above 90 percent across more than 40 defect types; line-scan inspection up to 60 metres a minute.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
c03-S01 · Grade A
Product Life Cycle Accounting and Reporting Standard
Using the standard, companies can measure the greenhouse gases associated with the full life cycle of products including raw materials, manufacturing, transportation, storage, use and disposal.
2011. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S02 · Grade A
Corporate Value Chain Scope 3 Accounting and Reporting Standard
Users of the standard can now account for emissions from 15 categories of Scope 3 activities, both upstream and downstream of their operations.
2011. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S03 · Grade A
Scope 2 Guidance
The Scope 2 Guidance standardizes how corporations measure emissions from purchased or acquired electricity, steam, heat and cooling (called “scope 2 emissions”).
2015. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S04 · Grade A
Corporate Accounting and Reporting Standard
The GHG Protocol Corporate Accounting and Reporting Standard provides requirements and guidance for companies and other organizations preparing a corporate-level GHG emissions inventory.
2004. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S05 · Grade A
ISO 14067:2018 Carbon footprint of products
This document addresses only a single impact category: climate change.
2018-08. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S06 · Grade A
New EU rules for measuring environmental impact of clothes and shoes
These rules introduce a science-based and impartial method to assess the environmental impact of clothing and shoes across their entire lifecycle, from raw material extraction, production and logistics to use and end-of-life.
2025-06-25. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S07 · Grade B
Materials Market Report 2025
The latest report, which looks at total fiber volumes used for apparel, home textiles, footwear, or any other application, shows that global fiber production increased from 125 million tonnes in 2023 to 132 million tonnes in 2024.
2025-09-18. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S10 · Grade B
PACT Methodology Version 3 for product carbon footprints
The PACT Methodology Version 3 provides a harmonized, transparent, and practical framework for product-level carbon accounting.
2025-04-30. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S12 · Grade A
Communication must play a critical role in fashion's climate response
In one life cycle assessment carried out on behalf of UNEP, the use phase was considered responsible for 24% of the sector’s greenhouse gas emissions, with a baseline year of 2016.
2021-11-08. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S16 · Grade B
Introduction to the database
The processes in the ecoinvent database represent the average production conditions within a geographical location, rather than company-specific or site-specific conditions.
2025-11-05. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S20 · Grade A
Greenhouse gas reporting conversion factors 2026
The UK government conversion factors for company reporting of greenhouse gas emissions enable users to calculate and report their emissions based on their activity data, such as volume of fuel used, kWh of electricity purchased, or distance travelled, for their Scope 1, 2 and 3 emissions separately.
2026-06-11. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S21 · Grade A
Making Private Standards Work for You
Developing country suppliers will be increasingly pressured to limit their carbon footprint because of their business partners' commitment.
2010. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S22 · Grade B
Life Cycle Assessment studies and responsible data use
Results from LCA studies are sensitive to methodological choices, assumptions, and boundaries.
2026-07-16. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S23 · Grade A
Technical Guidance for Calculating Scope 3 Emissions
In fact, data collected from a supplier may actually be less accurate than industry-average data for a particular product.
2013. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S24 · Grade A
ISO 14040:2006 Life cycle assessment principles and framework
The intended application of LCA or LCI results is considered during definition of the goal and scope, but the application itself is outside the scope of this International Standard.
2006-07. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S25 · Grade A
ISO 14044:2006 Life cycle assessment requirements and guidelines
ISO 14044:2006 covers life cycle assessment (LCA) studies and life cycle inventory (LCI) studies.
2006-07. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S26 · Grade B
Review of Methodological Choices in LCA-Based Textile and Apparel Rating Tools
This review found that the provision of, and adherence to the appropriate standards and best practice in LCA would rectify most of these issues.
2019-07-15. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S27 · Grade B
A New Textiles Economy: Redesigning Fashion's Future, summary of findings
In 2015, greenhouse gas (GHG) emissions from textiles production totalled 1.2 billion tonnes of CO2 equivalent, more than those of all international flights and maritime shipping combined.
2017. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S29 · Grade A
Climate-Smart Agriculture Sourcebook: Sustainable soil and land management
The manufacturing, processing and applying synthetic nitrogen fertilizers emit considerable greenhouse gases.
2017. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S30 · Grade A
Textiles and the environment: the role of design in Europe's circular economy
About 80% of the total climate change impact of textiles occurs in the production phase.
2022. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S31 · Grade B
A Comparative Life Cycle Assessment of T-Shirt Production Using from Viscose, Lyocell, Cotton, and Polyester
However, Lyocell also shows the highest carbon footprint (21.6 kg CO2eq/kg) unless produced in regions with cleaner energy mixes.
2026-04-20. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S32 · Grade A
Directive (EU) 2024/825 of the European Parliament and of the Council
Such claims should only be allowed when they are based on the actual lifecycle impact of the product in question, and not based on the offsetting of greenhouse gas emissions outside the product’s value chain, as the former and the latter are not equivalent.
2024-02-28. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S0301 · Grade A
EU Product Environmental Footprint Category Rules (PEFCRs) for Apparel: An Overview
Functional unit : One use of the garment, accounting for typical lifespan and number of washes based on product type.
2025-07-22. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c03-S0302 · Grade B
A Comparative Life Cycle Assessment of T-Shirt Production Using from Viscose, Lyocell, Cotton, and Polyester
Results show that cotton T-shirts exhibit the lowest global warming potential (14.1 kg CO2eq/kg) but the highest water demand (2.9 m3/kg) in China.
2026-04. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗S01 GHG Protocol. 2011.
S24 International Organization for Standardization. 2006-07.
S22 Textile Exchange. 2026-07-16.
S26 Watson and Wiedemann, Sustainability. 2019-07-15.
S23 GHG Protocol and Carbon Trust. 2013.
S31 Forfora et al., Sustainability. 2026-04-20.
S0301 European Commission Directorate-General for Internal Market, Industry, Entrepreneurship and SMEs. 2025-07-22.
S0302 Aalto University Research Portal. 2026-04.
S06 European Commission. 2025-06-25.
R03 SODECOTON. Publication date unrecorded; inherited source-text check.
S10 World Business Council for Sustainable Development. 2025-04-30.
S32 European Parliament and Council of the European Union. 2024-02-28.
S25 International Organization for Standardization. 2006-07.
S16 ecoinvent. 2025-11-05.
R06 Cameroon Trade Hub. Publication date unrecorded; inherited source-text check.
R07 Ecofin Agency. Publication date unrecorded; inherited source-text check.
R08 Business in Cameroon. Publication date unrecorded; inherited source-text check.
R09 Ecofin Agency. Publication date unrecorded; inherited source-text check.
R10 Ecofin Agency. Publication date unrecorded; inherited source-text check.
S20 UK Department for Energy Security and Net Zero. 2026-06-11.
S05 International Organization for Standardization. 2018-08.
S04 GHG Protocol. 2004.
S12 United Nations Environment Programme. 2021-11-08.
S30 European Environment Agency. 2022.
S02 GHG Protocol. 2011.
S27 Ellen MacArthur Foundation. 2017.
R29 MDPI; industry inspection literature. Publication date unrecorded; inherited source-text check.
S29 Food and Agriculture Organization of the United Nations. 2017.
S03 GHG Protocol. 2015.
S07 Textile Exchange. 2025-09-18.
S21 United Nations Industrial Development Organization. 2010.
Keep the thread · chapter 03 of 14
Move the shuttle along the rack to preview any chapter: its sections, exhibits and reading time. Draft web edition. This research is not investment, legal or tax advice; illustrative models are not measured factory results.
The paper's rack · 14 boltsBolt length: reading time
01Part I: Build the account before the claim
A garment number becomes decision-ready only when its boundary, function, evidence and intended use are explicit.
02Part I: Build the account before the claim
A controlled chart of accounts lets site emissions, supplier emissions and product emissions meet once and only once.
03Part I: Build the account before the claim
The same inventory can support a sourcing decision or mislead the public, depending on the function and boundary chosen.
04Part I: Build the account before the claim
A screening model earns its keep by showing where primary evidence will change the decision most.
05Part II: Follow carbon through the garment
A cotton footprint is built from farm activity and allocation choices, not from a generic natural-fibre label.
06Part II: Follow carbon through the garment
Processing geography, thermal energy and functional performance can matter as much as the fibre name.
07Part II: Follow carbon through the garment
A factory can account precisely for its own operations only when utilities, output and allocation share the same time and line structure.
08Part II: Follow carbon through the garment
A route footprint depends on mass, loading, mode, fuel, empty running and upstream energy, not only kilometres.
09Part II: Follow carbon through the garment
A garment is not fully accounted until care, service life and disposal are made explicit.
10Part III: Reduce carbon without moving the problem
A reduction claim is credible only when a measured action changes a defined baseline without shifting the burden elsewhere.
11Part III: Reduce carbon without moving the problem
Electricity and heat decarbonisation require meter data, contractual evidence and a separate solution for thermal demand.
12Part III: Reduce carbon without moving the problem
A lower footprint per garment is not enough when volume, substitution or rebound raises the total.
13Part IV: Make the account operable
Every published footprint needs reproducible arithmetic, proportionate review and wording bounded by the evidence.
14Part IV: Make the account operable
The first shift should produce a controlled carbon record that improves with each phase of the factory's operating system.