>that must take a bunch of energy - although presumably not as much as smelting steel? You'd be surprised. Steel is 20MJ/kg[1], epoxy resin is 80MJ/kg[2]. FWIW

>that must take a bunch of energy - although presumably not as much as smelting steel? You'd be surprised. Steel is 20MJ/kg[1], epoxy resin is 80MJ/kg[2]. FWIW, aluminium is 150MJ/kg. [1]https://en.wikipedia.org/wiki/Embodied_energy#In_common_materials https://en.wikipedia.org/wiki/Embodied_energy#In_common_mate... [2] https://compositesuk.co.uk/composite-materials/faqs/embodied-energy https://compositesuk.co.uk/composite-materials/faqs/embodied...