This insatiable greed will be our downfall, and there's nothing natural about it.

I would argue that it is natural, that avarice and greed are natural things. My theory is that the overactive amygdala in our brains is ill-suited for modern societies that exist due to large-scale cooperation and some flavor of magnanimity. Though it's obviously an evolutionary adaptation for our ancestors, the irony is that it will be a large cause of our extinction.