You're right. We would need to burn the equivalent of about 1000 times the total biomass of the earth to convert the majority of the oxygen in the air into carb

You're right. We would need to burn the equivalent of about 1000 times the total biomass of the earth to convert the majority of the oxygen in the air into carbon dioxide (or water in this process). I'm moderately interested in how much hydrogen we could burn without noticeably adding to sea-level rise. Probably quite a bit.