The amount of carbon we need to make carbon fiber is much, much smaller than the amount of carbon we need to take out of the atmosphere to stop global warming.
The global output of carbon fiber is about 100,000 tons per year. We emit that much CO2 every minute. Even if we transitioned the entire carbon fiber industry so that it only used carbon captured from the air AND we made sure that all carbon fiber facilities obtained 100% of the their energy and their resources from carbon neutral sources (which would be a hugely expensive project) it would not make a measurable difference in net CO2 in the atmosphere.
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