阅读：Light pollution  光污染问题

Dean

If you've ever driven toward a big city at night and seen its glow from afar, you've witnessed light pollution. It occurs when light from streetlights, office buildings, signs, and other sources streams(射入) into space and illuminates（照亮）the night sky. This haze（朦胧）of light makes many stars invisible to people on Earth.

Light pollution doesn't just put a damper（影响）on amateur（业余 ）stargazing（观星）. Hazy skies also make it far more difficult for astronomers（天文学家）to do their jobs. Some of the earliest telescopes and observatories were placed as far away from civilization as possible so that astronomers could observe the faintest（最微弱的）galaxies（星系）without interference（干涉）by city lights.

But cities are getting larger. Suburbs are growing in once dark, rural areas. Light from all this new development is increasingly obscuring（使暗淡）the faint light given off by distant stars and galaxies. And if scientists can't locate these objects, they can't learn more about them.
Light pollution doesn't only affect star visibility. It can harm wildlife too.

Scientists don't entirely understand how animals navigate（飞行）at night, but it's clear that artificial（人造）light can attract them, making them go off course（航道）. There's increasing evidence（迹象）, for example, that migrating birds use sunsets and sunrises to help find their way, says Sydney Gauthreaux Jr., a biologist at Clemson University in South Carolina.

\"When light occurs at night,\" he says, \"it has a very disruptive（分裂性）influence.\"

Sometimes birds fly into lighted towers, high-rises, floodlit smokestacks（烟窗）, and cables from radio and television towers. Experts estimate that millions of birds die this way every year.

Sea turtle hatchlings（孵化）also depend on moonlight and starlight to guide them into the water. Artificial lights can disorient（迷失方向）these animals. They often end up heading toward lit-up parking lots, beach houses, and hotels by mistake.

Some night lights are necessary, of course. But the International Dark-Sky Association, an organization based in Tucson, estimates that 30 percent of artificial nighttime lighting is wasted.

坏小孩

沙发 看不懂！

lover_bai

we can't prevent Light pollution .

Because night lights stand for a city or country 's thriving and prosperous.

And most people approved this opinion.