I don’t think this would be such an issue. There’s about 500x as much oxygen in the air as carbon dioxide. Increasing the amount of carbon dioxide by 140ppm i

I don’t think this would be such an issue. There’s about 500x as much oxygen in the air as carbon dioxide. Increasing the amount of carbon dioxide by 140ppm is a 50% increase in carbon dioxide levels since pre industrial times. Reducing the about of oxygen, currently at 209,000ppm, by 140ppm seems like it would have a negligible effect. The far greater likely issue with natural hydrogen is that we simply don’t find any deposits of it that are both significant and economically extractable. And in the mean time we use it as an excuse to not do anything about carbon emissions.