The first thing that Kingsnorth did was draft a manifesto. Also called “Uncivilization,” it was an intense, brooding document that vilified progress. “There is a fall coming,” it announced. “After a quarter-century of complacency, in which we were invited to believe in bubbles that would never burst, prices that would never fall . . . Hubris has been introduced to Nemesis.”

The initial print run of “Uncivilization” was only 500 copies. Yet the manifesto gained widespread attention. The philosopher John Gray reviewed it in The New Statesman. Professors included it on their reading lists. An events space in Wales invited Kingsnorth and Dougald Hine, Dark Mountain’s co-founder, to put on a festival; 400 people showed up. Doug Tompkins, the billionaire who started the outdoor-apparel company the North Face, and his wife, Kristine Tompkins, the former C.E.O. of Patagonia, offered financing and invited Kingsnorth and his family to spend two months on land they own in southern Chile.

Rightly, Kingsnorth and Hine insist that our present environmental difficulties are not solvable problems, but are inseparable from our current way of living. When confronted with problems that are insoluble, however, the most useful response is not to await disaster in the hope that the difficulties will magically disappear. It is to do whatever can be done, knowing that it will not amount to much. Stoical acceptance of this kind is practically unthinkable at present - an age when emotional self-expression is valued more than anything else. Still, stoicism will be needed if civilised life is to survive an environmental crisis that cannot now be avoided. Walking on lava requires a cool head, not one filled with fiery dreams.