The critic Raymond Williams once wrote that every historical period has its own “structure of feeling.” How everything seemed in the nineteen-sixties, the way the Victorians understood one another, the chivalry of the Middle Ages, the world view of Tang-dynasty China: each period, Williams thought, had a distinct way of organizing basic human emotions into an overarching cultural system. Each had its own way of experiencing being alive.

In mid-March, in a prior age, I spent a week rafting down the Grand Canyon. When I left for the trip, the United States was still beginning to grapple with the reality of the coronavirus pandemic. Italy was suffering; the N.B.A. had just suspended its season; Tom Hanks had been reported ill. When I hiked back up, on March 19th, it was into a different world. I’ve spent my life writing science-fiction novels that try to convey some of the strangeness of the future. But I was still shocked by how much had changed, and how quickly.

Schools and borders had closed; the governor of California, like governors elsewhere, had asked residents to begin staying at home. But the change that struck me seemed more abstract and internal. It was a change in the way we were looking at things, and it is still ongoing. The virus is rewriting our imaginations. What felt impossible has become thinkable. We’re getting a different sense of our place in history. We know we’re entering a new world, a new era. We seem to be learning our way into a new structure of feeling.

In many ways, we’ve been overdue for such a shift. In our feelings, we’ve been lagging behind the times in which we live. The Anthropocene, the Great Acceleration, the age of climate change—whatever you want to call it, we’ve been out of synch with the biosphere, wasting our children’s hopes for a normal life, burning our ecological capital as if it were disposable income, wrecking our one and only home in ways that soon will be beyond our descendants’ ability to repair. And yet we’ve been acting as though it were 2000, or 1990—as though the neoliberal arrangements built back then still made sense. We’ve been paralyzed, living in the world without feeling it.

Now, all of a sudden, we’re acting fast as a civilization. We’re trying, despite many obstacles, to flatten the curve—to avoid mass death. Doing this, we know that we’re living in a moment of historic importance. We realize that what we do now, well or badly, will be remembered later on. This sense of enacting history matters. For some of us, it partly compensates for the disruption of our lives.

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