お手本の文章
Listening for the last quiet places
At six o'clock on a Tuesday morning, the botanist Imre Valk stands at the edge of a drained reservoir and does nothing at all. For eleven minutes he listens. A distant tractor, a wren, the faint tick of cooling stones: that, he says, is as good as it gets.
Valk has spent the best part of a decade mapping what he calls acoustic refuges, places where no human-made sound intrudes for a quarter of an hour at a stretch. When he began, he expected to find them in the remoter reaches of the country. Instead he found that they were vanishing everywhere, shrinking like ice at the edge of a warming sea. Of the three hundred sites he surveyed, fewer than forty still qualify.
The causes are unglamorous: ring roads, delivery drones, the ceaseless hum of ventilation plants. But Valk is more interested in the consequences, which are subtler than mere irritation. Studies he cites suggest that sustained noise nudges up stress hormones even in people who claim to have grown accustomed to it. Habituation, he argues, is not the same as immunity; we simply stop reporting a cost that we continue to pay.
Not everyone is persuaded. Critics point out that cities have always been noisy, and that the clatter of a nineteenth-century street would make a modern commuter wince. Valk concedes the point with a shrug. "Noise is not new," he says. "What is new is that there is no longer anywhere to retreat to."
That, perhaps, is the heart of the matter. Silence has become a scarce resource and, like most scarce resources, it is beginning to be sold. Hotels advertise rooms free of electronic hum; some retreats charge a small fortune for the privilege of being told to say nothing. It is a curious irony that something once available to anyone with a field and a free afternoon should now come with a price tag.
Valk has little patience for such enterprises. His own modest campaign aims to have a handful of the surviving refuges protected, much as ancient woodland is. Whether it succeeds is hard to say. As the light strengthens over the reservoir, a car door slams somewhere beyond the trees, and his eleven minutes are over. He writes the time in his notebook and, with the air of a man making a modest entry in a ledger, closes it.