Well that is depressing.
Some fitness gradients are impossible to climb: genetic diversity is currency, and you need a lot of it to overcome more difficult shifts in the evolutionary landscape. As the world changes, species spend down this genetic currency (through death and selection). Now the world is impoverished.
But there is a solution: we, humans, can take our boots off the throats of the rest of God's creatures. We have the capability to be good ecological citizens of this planet, perhaps more than any other species. We can create our own energy sources; we can refine and recycle our material inputs, producing a tight, closed loop of biomass and energy around ourselves.
With this light touch on the world, the negative pressure we place on the downtrodden masses of creatures by disturbing their ecological spaces will vanish. And the denizens of Earth will then reacquire the wealth of diversity that is the natural reward of merely living.
Pass.
Also, all of human history (millions of years) before the invention of agriculture.
In any event, today it is clearly do or die.
Not that we were any better before we settled down as agriculturalists. Within a relative eyeblink of the first humans crossing the Bering land bridge into North America, virtually all of the large mammals went extinct in short order, and that was when we were still hunting with Clovis points on the end of a stick.