Nanotechnology Trial Highlights Route to Carbon Negative Cars

Climate Home reported that researchers from Vanderbilt and George Washington universities have shown how to convert carbon dioxide from the air into carbon nanotubes for use in batteries.
According to the article:

As well as demonstrating a way to clean up transport, the trials suggest carbon dioxide has an economic value. It is worth US$18 a kilogram as a battery material, the researchers estimate.

Co-author and mechanical engineer Cary Pint said:

This unlocks this whole space of research. Now you can take CO2 and use it to make products to overcome big challenges in technology.

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