Dingelingeling! Highly interesting article on the carbon footprint of bicycle production and use on my favorite website (the low tech magazine). My no. 1 take-away: in terms of life-cycle assessment a steel-frame electric bike has a lower footprint than a non-electric aluminium-frame bicycle! Read much more here
https://solar.lowtechmagazine.com/2023/02/can-we-make-bicycles-sustainable-again.html