LCA is a tool developed originally for estimating and optimising resource uses within individual linear product supply lines and has value when used for these purposes. However, LCA has many known technical limitations, and for this reason, LCA guidelines including ISO warn against using these simplistic measurements to compare one fibre to another in public facing communications. Some of the more serious methodological limitations include its current weaknesses in dealing with circularity, in accounting for microplastic pollution, and in accounting effectively with biogenic carbon. However, despite these limitations and warnings, LCA data is widely used across-fibres and supply chains, including to compare products of biogenic origin with those derived from fossil carbon. At this point, none of the current fibre footprinting methodologies account for the positive impacts of animal fibre production, such as supporting biodiversity, regenerative practices, carbon capture and sequestration and the many socio-economic impacts of agricultural communities around the world.