Not so sure that a carbon structure could be considered green, given the processes involved in the manufacture of the fibre and the structures.

And the recycling process consists of chopping the carbon scrap up and (basically) burning it, leaving a mix of short fibre strands that can be cleaned & reused. Not sure that this is particularly green either, though it does at least provide a route to (limited) reuse and might be better/more cost effective than landfill.

In any case you can get a conventional vehicle to get close enough to this performance without doing anything particularly clever, which is inevitably a cheaper and more friendly prospect than some radical redesign with composites.