The complicated history of how the Earth’s atmosphere became breathable

Biology, geology, and chemistry all worked together to make the present atmosphere.

https://arstechnica.com/science/2023/05/the-complicated-history-of-how-the-earths-atmosphere-became-breathable/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social

The complicated history of how the Earth’s atmosphere became breathable

Biology, geology, and chemistry all worked together to make the present atmosphere.

Ars Technica
@arstechnica So much discussion of other things, when the simple answer is "the atmosphere became breathable when animals evolved lungs." ;)