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[–]stickdog 2 insightful - 3 fun2 insightful - 2 fun3 insightful - 3 fun -  (1 child)

No, the ultimate cause is the bacteria that put oxygen in the atmosphere billions of years ago.

[–]weavilsatemyface 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (0 children)

Curse those photosynthesising bastards! 😉