Deciduous trees lose their leaves in winter. Therefore, the process of photosynthesis for such trees in winter becomes impossible. Accordingly, trees cannot produce oxygen.
As a matter of fact, there is less oxygen in the air in winter. But we do not feel it, as the difference is insignificant – 0.01%.
The stability of the oxygen level on the planet can be maintained depending on a number of factors. The first is that the Earth in principle has a large supply of oxygen. The atmosphere contains about 1,080,000 gigatons of oxygen, and the air masses are in constant motion.
The second factor – 80% of the oxygen is released by algae. The rest is wood. But there aren’t many deciduous trees on the entire planet.
Global warming also plays a role. According to a 2017 article published in Nature, algae are better at photosynthesis in a warmer environment. Terrestrial plants also love heat, so global warming has a positive effect on them.
Source: Ferra

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