Successive ice ages and the warm periods that separate them (we are in one) both eliminate lots of existing species and create opportunities for waves of new ones that take advantage of the new circumstances.
Why would this be different?
A much greater problem is that the vast increase in humans is crowding nature out.
It's overpopulation, over use of resources, and over grazing that will leave us chewing Soylent Green.
Well, future humans, I mean.
It's a ways off, yet.
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