Probably not. I believe exercise makes us use oxygen more efficiently, but I know of no way to reduce our oxygen consumption as a species.
No, we need to breathe oxygen to survive. If we want to increase the oxygen in the atmosphere we could plant more trees which take in the CO2 we breathe out and give off oxygen.
It is very unlikely that there is a way to get humans to consume less oxygen, as our oxygen consumption is a set biological process. While the amount consumed varies from individual to individual, the average rate is a steady amount across the species. If you are an endurance or aerobic athlete, you may consume oxygen more efficiently, thereby minimally reducing the amount consumed. It is impractical to assume that everyone on Earth would become a long distance runner over night.
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