Audio.
Almost all of the coal in the entire world was made during the carboniferous period. 60 million years - a blink of the eye, in terms of Earth history.
Why? 'coz before trees, it was mostly
60 mill years later, the detritivores figured out how to eat it.
If you find this kind of thing interesting, you'll enjoy Matt Parker. If you don't, fair enough - this is an incredibly geeky rabbithole.

(, Fri 19 Feb 2021, 19:41, Reply)
The book is now on my shopping list - cheers!
I can't believe I've never seen the "double domino" effect before.
youtu.be/EYkBctqyKic
(, Sat 20 Feb 2021, 7:47, Reply)
300 million years ago. Grasses didn't arise until about 55 million years ago.
(, Sat 20 Feb 2021, 11:25, Reply)