throwaway87915

It works out carbon negative because pieces of algae fall down to the ocean floor and remain there, as a side effect of algae cultivation. It's a significant number.

Isn't that about the fuel and not the vehicle?

If we manufactured diesel out of wood or algae, the same cars would suddenly become very green - in case of algae cultivation for fuel, you can reach carbon negativity (the process net-decreased carbon in atmosphere).

This is likely more green than building battery electric vehicles with large capacity. Batteries are great but cars don't need more than 100km of charge. Longer trips should be on bio-diesel or bio-gas.