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dst2
This is worth a read:
https://www.theguardian.com/environment/bike-blog/2021/sep/23/why-arent-more-big-bike-firms-tracking-their-environmental-impact
Trek are the first bike brand to publish a sustainability assessment, which gives some figures as to the environmental cost of manufacturing and using a bike. The additional cost of carbon fibre, effectively three times more impactful than aluminium, is particularly noteworthy.