An earlier version of this post misstated the timing of extinctions of some pronghorn species.
In a niche-model community, such invasions should result in extinctions of some of the existing species.
Earth history provides good news in this department: there have been more originations of new species than extinctions of old.
At the same time, we are in the midst of one of the great species extinctions of geological history.
We are bringing about species loss on the scale of some of the natural extinctions of palaeohistory.
This applies, in my view, to the towering seas, storms, droughts and mass extinctions of popular climate catastrophism.
One of the most common charges against alien species is that they cause mass extinctions of native species.
"Our research shows that the ongoing extinctions of lizards are directly due to climate warming from 1975 to the present.
That is, if the storms, droughts, rising sea levels and mass extinctions of species are to remain within "manageable" limits.
The stratigraphic record is most complete for extinctions of marine life foraminifers, ammonites, coccolithophores, and the like.
"If we can't contain it, we're going to see extinctions of listed species, and some of species that are not even listed".
