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better options energy / pollution-wise
Probably not, or people would already use them. The sort of short weak carbon fibres which work to clog holes in a tyre sealant can be made from biomass of various kinds, as the first carbon fibres were. Current efforts seem to centre around lignin, as vast amounts of waste lignin emerge from paper making.
gbj_tester
Netakure
Carbon fibres, I should have said. There surely must be better options energy / pollution-wise.