There have been other times when plants have gone extinct at the current rate. They usually involved city+ size asteroids.
> Most extinctions have occurred in the last 114 years (that is, since 1900; Table 1).
> modern extinction rates for vertebrates varied from 8 to 100 times higher than the background rate
> for example, that under the 2 E/MSY background rate, 9 vertebrate extinctions would have been expected since 1900; however, under the conservative rate, 468 more vertebrates have gone extinct than would have if the background rate had persisted across all vertebrates under that period. Specifically, these 468 species include 69 mammal species, 80 bird species, 24 reptiles, 146 amphibians, and 158 fish.
https://advances.sciencemag.org/content/1/5/e1400253?utm_sou...
It doesn't matter if the climate is or isn't shifting.
It doesn't matter if humans did or didn't cause this.
It doesn't matter if the species will go extinct or will evolve to survive in some form.