Comic #4932: cyanobacteria

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Here is the transcription of the comic text:

Panel 1: 2.3 billion years ago… "Fellow cyanobacteria! We have to stop dumping oxygen into the atmosphere!"

Panel 2: "Sure, it's the easy thing to do, but if the environment gets too oxygenated, we'll begin a process of 'global mammalianizing.'" "Nothing will change in our lifetimes, but our descendants one day will be pooped on by giant smelly furry creatures."

Panel 3: Later… "Look at that strange star moving in the sky!" "That's an elk's anus, Steve." "God, I hate living in the apocalypse."