| Clamor: How Noise Took Over the World—and How We Can Take It Back is a deep dive into the acoustics of sound, hearing, and the soundscapes that surround us. Sound is a wave of energy triggering a rhythmic cascade of molecules crashing into each other. When this cascade reaches our ears, the vibrations trigger hair cells sensitive to different frequencies of sound, and this information is conveyed to our brain where we interpret and react to it. One of the peculiar elements of sound is that it’s transitory. A car alarm might “trigger a visceral, even furious response” but when it stops, “you do your best to return to sleep, get back to your work, or resume your conversation. Your mind moves on to more important matters—at least until the next interruption.” |
| Sleep studies indicate “that noise can splinter our slumber below the level of our conscious awareness, harming health even among people who claim not to be bothered.” When we sleep, our eyes close, but our ears remain on guard duty “listening for potential threats. … From an evolutionary perspective, prolonged sleep is a necessary but dangerous behavior, because it makes us easy prey.” |
“The spread of our mechanized din, alongside the glow of artificial light, into wild areas has brewed up what conservationists have dubbed a ‘sensory smog,’ hindering animals as they try to communicate, sense the presence of predators, hunt for food, ... woo mates, fight off rivals, care for their young, flee predators, and migrate ... a noise-saturated environment makes all those activities more taxing …robbing them of energy they can’t afford to lose."
One scientist noted: “Once you reduce noise by treating its source, it’s gone, and the recovery can begin right away.”
| Sound pollution is especially problematic for marine animals. Because water is denser than air, sound travels four times faster through the ocean, which means noise from ships fills a large expanse. And because “light to see by is at a premium” sound is a critical sense for many sea creatures. For example, “baby reef fish and coral larvae begin life in the open ocean and find their reef homes partly by listening for them.” “In a quieter ocean, [whales] could hear a mate or family member call from twenty kilometers away, but that’s now reduced to a kilometer or two. Noise adds to the fabric of what’s making it harder for these whales to get by.” |
| “Research vessels designed for enhanced quiet are equipped with precision engineered propellers, which churn up less [noise-inducing] cavitation.” Adding “more streamlined hulls, drag-reducing coatings, and sound absorption in engine rooms, [can] achieve a drop of tens of decibels compared to typical ship noise. Ships with these upgrades are not only quieter, but also more efficient, which saves money on fuel.” |
“As a result, one of the biggest noise challenges of our time concerns cognitive overload.” This noise-induced cognitive overload can become dangerous in hospitals, where beeping alarms are so ubiquitous, healthcare workers (and patients) mentally tune them out.
Highway and airplane noise are most often concentrated in vulnerable, impoverished neighborhoods, where the constant racket contributes to health problems as wells as poor school performance.
| | While obnoxious noises ramp up “stress and distraction, there’s mounting evidence that listening to nature sounds may be an antidote, relieving stress and restoring attention.” Our “perception of noise is elastic, swayed by our attention as well as innate and learned associations with certain sounds. The same goes for our sense of quiet.” The author promotes thinking in terms of the overall “soundscape” in a given environment. |
For example, the Boston Museum of Fine Arts wanted an atrium cafe in an open area with high ceilings and stairwells, a recipe for a loud dining experience.
But the soundscape designers used “17,000 square feet of sound absorption that [was] artfully camouflaged within the atrium’s design … The steel beams supporting the glass curtain walls were faced with a black-metal grill that hid a thick layer of fiberglass insulation. Overhead, translucent vinyl [was] stretched across a steel frame [hanging] from the ceiling; perforated with tiny invisible holes, it sandwiched a 9-inch air gap that trapped sound.” They also used hidden speakers to provide ambient sound.
| Another instance: a busy party street, with lots of bars and live-music venues, neighbors complaining regularly about the noise. When calming music was piped in, the “vibe of the area changed dramatically, replacing the usual angry shouts, shattered bottles, car horns, and police sirens with something closer to groovy mood music. Compared to the typical Saturday night experience, the number of noise complaints plummeted, and police were able to keep a lower profile, even redeploying units to other parts of the city.” |
In the author’s words: “To care about chronic stress, distraction, sleep deprivation, patient safety, environmental justice, and habitat loss is to care about noise.”
Sounds Wild and Broken, An Immense World, Being a Bird