Green Batteries (Photosystem I)

The Photosystem II (water burning) can't keep going without the second stage Photosystem I. It involves taking the electrons that are stripped from the water molecules in the first step and using them before they decay.

Photosystem I keeps the hard-earned energy by sticking these electrons on a chemical assembly line. It is then used to convert CO2 into sugar that bacteria can use as food.