Human caused extinction is extremely accelerated compared to species going extinct due to environmental changes like ending an ice age. It it also extremeley recent, compared to billions of years of evolution. So on one hand you have highly accelerated extinction in practically a blink of an eye (consider the last few hundred years or maybe few thousand if you go back to wooly mammoths - still a blink compared to billions). On the other hand, new species are not created by humans and it’s still widely science fiction to even consider the possibility.