I’m probably going to judge you if you say Holocene, without an interesting non-trivial reason.
The Azolla Event. https://en.wikipedia.org/wiki/Azolla_event. I mean it is cool and the major climate shift it helped create certainly caused some extinctions. But plants can change the world, never forget!
Very cool!
It reminds me of my fav, The Oxygen Catastrophy, where basically a plant did something new and caused the earth to freeze. In this case, by converting methane to carbon dioxide, a much weaker greenhouse gas.