[en] The fashion industry is divided into two business models, the one that bets on quantity over quality and the other that, prefers quality over quantity. Fast Fashion (FF) has been leading the industry for the last few decades and has led to a shift in consumption away from the usual. Constantly changing trends and a wide range of products at affordable prices have meant that customers are buying more and more and discarding clothes earlier and earlier. For companies this means mass production with low quality in developing countries to increase margins and make more profit. But these activities have made the textile industry one of the most polluting industries. Slow Fashion (SF) appears as an alternative to reduce this impact, advocating for more sustainable materials and local production. It seems that more and more businesses are born with these basic values, but Does Slow Fashion really generate less environmental impact than Fast Fashion? The aim of this final degree project is to answer the above question. Throughout the project we will test the hypothesis as to whether SF is less polluting than FF and is a good alternative. To do so, a comparative study of the supply chain (SC) of both business models will be carried out. Analysing the impacts of the fibres mostly used in the industry, and of the transport involved from the origin of the fibres to the point of sale. To carry out the analysis, nine different garments will be characterised to represent each model, which will serve to determine and compare the results obtained. The impact of the fibres will be calculated based on three indicators; global warming potential (GWP), primary energy demand (PED) and water consumption (WC), for which the information is obtained from a literature review. As each "type" garment is composed of different fibres, the corresponding percentage of each will be determined based on the parameterisation of data from ten companies. As well as the sections of the transport route from which the CO2 emissions emitted by each garment will be calculated. After the study it has been determined that FF garments have a higher impact on GWP and PED, with an average of 38% and 51% higher than SF respectively. While WC is at least 11% higher for most SF garments. Emissions from transport are from 30% to 59% higher on the FF garments routes. It can therefore be concluded that SF SC is generally less polluting. Although it cannot be assumed that all activities under SF have low impacts, as several exceptions have been found that require further investigation and concern by industry and business.

[gl] A industria da moda está dividida en dous modelos de negocio, o que aposta por cantidade antes que calidade e o que, ao contrario, prefire a calidade antes que a cantidade. O Fast Fashion (FF) que lidera a industria desde as últimas décadas, provocou un cambio de consumo. O continuo cambio de tendencias e a ampla oferta de produtos a prezos alcanzables favoreceu que os clientes cada vez aumenten as súas compras e refuguen antes a roupa. Para as empresas, isto significa unha produción masiva de baixa calidade en países en desenvolvemento para aumentar as marxes e ter maiores beneficios. Estas actividades converteron á industria téxtil nunha das máis contaminantes. O Slow Fashion (SF) xurde como alternativa para diminuír ese impacto, avogando por materiais máis sostibles e unha produción de proximidade. Parece que cada vez máis negocios nacen con estes valores de base, pero realmente o Slow Fashion xera menos impacto ambiental que o Fast Fashion? A realización deste traballo de fin de grao ten o obxectivo de responder á pregunta anterior. Ao longo do mesmo buscarase validar a hipótese sobre se o SF é menos contaminante que o FF e, plo tanto, unhaboa alternativa. Para iso, realizarase un estudo comparativo da cadea de suministro (CS) de ambos os modelos de negocio. Analizando os impactos das fibras maiormente empregadas na industria, e do transporte implicado desde a procedencia das fibras ata o punto de venda. Para levar a cabo a análise caracterizaranse nove pezas diferentes para representar a cada modelo, as cales servirán para determinar e comparar os resultados obtidos. O impacto das fibras calcularase en base a tres índices; potencial de quentamento global (GWP), demanda de enerxía primaria (PED) e consumo de auga (WC). A información para estimalos obtense partir da revisión bibliográfica. Como cada peza "tipo" está composta por diferentes fibras, a porcentaxe correspondente de cada unha determínase en función da parametrización de datos procedentes de dez marcas, do mesmo xeito que os tramos da ruta de transporte a partir da cal se calcularán as emisións de CO2 emitidas por cada peza. Tras o estudo determinouse que as pezas do FF teñen un impacto maior en GWP e PED, cunha media do 38% e 51% máis alto que o SF respectivamente. Mentres WC é como mínimo un 11% maior na maioría das pezas SF. As emisións derivadas do transporte son desde un 30% ata 59% superiores na ruta das pezas FF. Por todo elo, pódese concluír que xeralmente a CS do SF é menos contaminante. Aínda que non se pode asumir que todas as actividades baixo o SF teñan impactos baixos, xa que se atoparon diversas excepcións que fan necesaria unha maior investigación e preocupación por parte da industria e empresas.