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Oct. 12, 2021, 1:24 a.m. -  fartymarty

"Throw in longevity and reparability and you could really do yourself in trying to figure out the most carbon friendly bicycle" - in my mind this is where metal (steel and aluminimu) bikes make the biggest difference.  Especially if you have your geo sorted and aren't looking to upgrade every few years to keep up wiht the latest fads.   I'd bet in 10 years time there wont be many 2021 carbon bikes on the trails as 2021 metal bikes. It is good to see Trek put this out.  At least it is a start and other manufacturers can follow and at least start the discussion about the carbon impact of bike. As an side on climate change  the following graph is interesting - [https://www.ucsusa.org/resources/each-countrys-share-co2-emissions](https://www.ucsusa.org/resources/each-countrys-share-co2-emissions) (despite being a few years old).  If we reduce all carbon emission here in the UK there is only a saving of 1% to be had.  Everyone needs to buy into it for it to work, consume less / make / buy products that last and can be repaired rather than disposable.

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