Thank you for your hard work David! Do I understand correctly that the source of energy for the conversion is (mostly) the hydrogen?

I've been interested in if we could use large bodies of water (like lakes or ponds) to both get a lot of interaction with CO2 from the air, and get energy from the sun to capture carbon. Do you think fermentation could work outside, or would we need a more resilient organism like algae or even seaweed?

My idea is to float a dark membrane on top of the water, with a thin layer of water on top. The dark membrane heats the water, sustaining the algae, and then the algae get robotically harvested. Could that work for your organism?