Is there enough oxygen for a growing population?

An adult human breathes approximately 11,000 litres of air a day, but is there enough oxygen for all of us in the future? Our lungs reduce the oxygen content in air from 21% to 15% when we breathe. The average human consumes about 660 litres of oxygen per day, while a large tree produces 92 litres a day. To sustain the oxygen levels humans require, we would need the equivalent of 49 billion trees, and fortunately, there are currently about 400 billion trees on Earth. However, other air-consumers like wildlife and fires also affect oxygen levels. Despite a small decline in oxygen content, we still have plenty of time to fix it.

https://www.greenlineprint.com/blog/is-there-enough-oxygen-for-a-growing-population

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