Plankton is to oil what:
A: Screwdriver is to Lemonade
B: Liberal is to Liberty
C: Fruitloops is to Garage door opener
D: All of the above
Actually what egg is to chicken. All petroleum originates from saltwater algae and related life forms. It's amazing to me how many people don't know that.
There is also a species of algae that emits hydrogen gas instead of oxygen when deprived of sulfur. So not only could we make unlimited biodiesel from sunlight and saltwater but hydrogen fuel as well.