Engineering360: "The road to artificial photosynthesis"

I'm not convinced efficiency matters. Area does, and they should know energy produced per square meter. Catalyst cost will depend on what catalyst, of course, but also how long it can keep working. Bacteria die, as noted, but they also reproduce.

Finally and critically, we need to reduce demand as well as change supply source, and know how much difference it would make if we (USA) use it only, or do we need the world on board?