Not long ago I wrote an essay[1] about what are called “existential risks,” aka “X-risks,” those calamitous possibilities (e.g., nuclear war, anthropogenic climate disruption, pandemic, and more, sometimes referred to collectively as the polycrisis) that are considered capable of rendering Homo sapiens extinct, or nearly so, and our present ways of life definitively so. I did not write about hopeful notions of ways humans might eliminate or mitigate the risks. I tend to believe the risks will cease being risks only after they become active realities since we don’t seem a notably life-loving, far-sighted, or prudent species. I wondered,...

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