[ATE/IW] Ecological Collapse

[Tallor]

Originally Posted by tshiggins

This, all by itself, would likely be enough. Create a fungal blight that affects grasses, that thrives in an environment with elevated levels of CO2, and watch civilization die.

This was the scenario at the beginning of Interstellar.

Shroom-1, the fungus planet. I can see it now.

On a more serious note, funguses actually breathe in oxygen, it's just that they can survive without it if they're capable of anaerobic respiration.

That's all I know, though.