ToughSF: It seems like every innovation in the history of life's evolution triggers some sort of catastrophe or extinction event. / The introduction of oxygen, the expansion of methane producing bacteria and now: the appearance of tree roots.
This points to a 15 November piece.
For awhile we were pondering its sequel, lignin-digesting fungi - and we still see some "white rot" lingering in the 'web - but a 2016 study raised some flags around that. The most recent study I can find on this topic is here. Probably why ToughSF doesn't mention it.
A more salient event must be the Cambrian explosion. The development of a photon-processing module in animals must have knocked off many many species who were doing fine before that Blink Of An Eye.
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