When we burn fossil fuels, it not only produces carbon dioxide, a driver of climate change, but it also consumes the oxygen we breathe. However, the amount of oxygen in our atmosphere produced by plants is nearly balanced by the amount consumed by animals, keeping it at around 21% of the atmosphere. This raises a big question relevant to our survival and the future of biodiversity: what keeps the levels of oxygen in our atmosphere relatively constant?
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Source: Phys.org