How many new species are being discovered?
https://stateoftheworldsplants.org/2017/new-plant-discoveries.html
1,730 new species discovered in the single year of 2016.
So for those keeping score, 571 extinict in 250 years versus 1,730 new species discovered in a single year.
If one does a simple linear extrapolotion... which is never correct to do, but is quite popular among certain Environmental Groups... Let's see how these numbers compare:
571 / 250 = 2.284 loss per year
or
1730 * 250 = 432,500 gain per 250 years
So... No, the Earth is not currently experiencing a Great Dying due to evil hummans and their awful Industrial Revolution.
RE: Plants are dying out at twice the speed of animals. We have already lost 571 species.