Tag: ozone layer
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The Breath You’re Taking Is a Biological Waste Product
The oxygen in Earth’s atmosphere exists almost entirely because of life — and without life continuously replenishing it, it would eventually vanish. Before cyanobacteria evolved photosynthesis roughly 2.4 billion years ago, there was almost no free oxygen at all. What we breathe today is, chemically speaking, biological waste. It also nearly ended life on Earth…