carbon fiber that is (CO2 in the atmosphere is a different, but related topic - related because light wt. design with CF increases fuel mileage, and thus CO2 emissions)
the cost of CF keeps going down...
this little puppy is only 1/4 million (sounds like a lot but it IS a Supercar; and IS 1/4 the price of their last supercar)
Then there is the new BMW - only ~~$40k. It doesn't seem very sporty but wait until BMW cranks up their new CF plant in Washington state to use CF in other models.
Lighter
Faster
Stronger