Today’s the shortest day of the year, so it may seem churlish to spend it complaining about light. But don’t get me wrong – it’s not sunlight I have a problem with. I can vaguely remember what it’s like, and I’m keen to renew the acquaintance. It’s light pollution that I want to talk about today.
It’s obvious how water pollution can harm wildlife – the dramatic decline of the otter in the mid 20th century is a well known example. And we’re hearing more about the health effects air pollution has for humans (and presumably wildlife are affected too). But there’s less awareness of the problem of light pollution.
Last week there was a story on the BBC website about how robins’ behaviour is affected by light pollution. A study by Southampton University found that robins that lived closer to lit paths and noisy roads were much lower down this dominance hierarchy – the birds in these territories displayed less aggressively.
Robins aren’t the only creatures affected by light pollution. Other birds, reptiles, amphibians, moths and bats are also affected negatively. But some species can adapt to make the most of it, like the common redshank, getting longer to feed because of artificial lights.
Another disadvantage of light pollution is that it stops us seeing so many stars. Where I live, in a street-lit town, I’m never going to see the Milky Way. On holidays to more remote, darker places, the stars at night take my breath away.
Light pollution is a subject that’s too close to home for me. My bedroom overlooks a recently refurbished office building that’s floodlit throughout the night, meaning that, despite the blackout lining of my curtains, my bedroom never properly gets dark.
In some places things are being done to reduce light pollution. The funding cuts for councils means many are now looking to save money (and reduce carbon emissions) by turning off street lighting in residential roads late at night. In fact, my council are introducing this to the town I live in next month. My road is a major traffic route, so the lights will stay on. But other, quieter roads, will have their lights turned off between midnight and 5am in the morning. Hopefully this will benefit at least some of the local wildlife and residents.
As for me, I’m looking forward to a trip west, where night will be dark, and, if the skies are clear, I’ll be able to see the Milky Way.