Light pollution increasing around globe Earth’s night lights as observed in 2016. (NASA )
Light pollution increasing around globe
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The world's nights are getting alarmingly brighter. That's bad news for all sorts of creatures, humans included.

A German-led team reported last Wednesday that light pollution is threatening darkness almost everywhere. Satellite observations during five Octobers show Earth's artificially lit outdoor area grew by 2 percent a year from 2012 to 2016. So did nighttime brightness.

Light pollution is actually worse than that, according to the researchers. Their measurements coincide with a change in outdoor light. The switch is to energy-efficient and cost-saving light-emitting diodes, or LEDs. The imaging sensor on the polar-orbiting weather satellite can't detect the LED-generated color blue. That's why some light is missed.

The observations, for example, indicate stable levels of night light in some places. These include the United States, Netherlands, Spain and Italy. But light pollution is almost certainly on the rise in those countries given this elusive blue light. That's according to Christopher Kyba. He is part of the GFZ German Research Center for Geosciences. He is also the lead author of the study published in Science Advances.

Also on the rise is the spread of light into the hinterlands and overall increased use. The findings shatter the long-held notion. The belief was that more energy efficient lighting would decrease usage on the global - or at least a national - scale.

"Honestly, I had thought and assumed and hoped that with LEDs we were turning the corner. There's also a lot more awareness of light pollution." That's what he told reporters by phone from Potsdam. "It is quite disappointing."

The biological impact from surging artificial light is also significant. That's according to the researchers.

People's sleep can be marred, which in turn can affect their health. The migration and reproduction of birds, fish, amphibians, insects and bats can be disrupted. Plants can have abnormally extended growing periods. And forget about seeing stars or the Milky Way, if the trend continues.

About the only places with dramatic declines in night light were in areas of conflict like Syria and Yemen, the researchers found. Australia also reported a noticeable drop, but that's because wildfires were raging early in the study. Researchers were unable to filter out the bright burning light.

Asia, Africa and South America, for the most part, saw a surge in artificial night lighting.

More and more places are installing outdoor lighting given its low cost and the overall growth in communities' wealth, the scientists noted. Urban sprawl is also moving towns farther out. The outskirts of major cities in developing nations are brightening quite rapidly, in fact, Kyba said.

Other especially bright hot spots: sprawling greenhouses in the Netherlands and elsewhere.

Photos taken by astronauts aboard the International Space Station also illuminate the growing problem.

Franz Holker of the Leibniz Institute of Freshwater Ecology and Inland Fisheries in Berlin, a co-author, said things are at the critical point.

"Many people are using light at night without really thinking about the cost," Holker said. Not just the economic cost, "but also the cost that you have to pay from an ecological, environmental perspective."

Kyba and his colleagues recommend avoiding glaring lamps whenever possible - choosing amber over so-called white LEDs - and using more efficient ways to illuminate places like parking lots or city streets. For example, dim, closely spaced lights tend to provide better visibility than bright lights that are more spread out.

The International Dark-Sky Association, based in Tucson, Arizona, has been highlighting the hazards of artificial night light for decades.

"We hope that the results further sound the alarm about the many unintended consequences of the unchecked use of artificial light at night," Director J. Scott Feierabend said in a statement.

An instrument on the 2011-launched U.S. weather satellite, Suomi, provided the observations for this study. A second such instrument - known as the Visible Infrared Imaging Radiometer Suite, or VIIRS - was launched on a new satellite by NASA and the National Oceanic and Atmospheric Administration. This latest VIIRS will join the continuing night light study.

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CRITICAL THINKING QUESTION
Why is this a bigger issue in some places, but not all places?
Write your answers in the comments section below


COMMENTS (50)
  • GemmaV-del
    12/05/2017 - 04:03 p.m.

    Light pollution is actually worse than that, according to the researchers. Their measurements coincide with a change in outdoor light. The switch is to energy-efficient and cost-saving light-emitting diodes, or LEDs. The imaging sensor on the polar-orbiting weather satellite can't detect the LED-generated color blue. That's why some light is missed.

  • JosephF-del
    12/05/2017 - 04:05 p.m.

    This article was about light pollution getting larger everyday. This is such an important issue because lights emit bad gasses and the more gasses are in the air, the more the air is polluted.

  • JohnB-del1
    12/05/2017 - 04:15 p.m.

    World's nights are getting alarmingly brighter. This is because that the brightness from our lights. These lights are affecting us and the growth of plants around the world.

  • ZofiaT-del
    12/05/2017 - 04:17 p.m.

    This article is about how light pollution is increasing slightly everywhere around the world. This causes the light to stop coming through to the Earth and causing it to become darker. Observations are still occurring to see why this happens.

  • AnnabelleA-del
    12/05/2017 - 04:21 p.m.

    Basically, this fabulous article is explaining that certain countries and continents are showing an increased level in light. When you look at the satellite images, you can actually see light on the surface of Earth, which, as you can tell, is not a good thing. This article was very interesting, and I believe it is important that our world is informed about this predicament.

  • NatalieH-del
    12/05/2017 - 04:25 p.m.

    Light pollution is spreading across the globe. It affects everybody more than you may think. It can mess with people's sleep, which can mess up their health. Reproduction and migration in creatures such as birds, fish, insects, bats, and amphibians can be affected negatively. Plants can have extreme and unnatural growing periods.

  • GabriellaJ-del
    12/05/2017 - 04:39 p.m.

    this article is about light pollution spreading.

  • MarianaG-del
    12/05/2017 - 04:44 p.m.

    This article is about light pollution and its effects. It is sad that LED are misleading. it also shows how you have to fight this problem.

  • SophiaD-del1
    12/05/2017 - 05:06 p.m.

    This issue about light pollution around the globe is a growing concern. Migration patterns, life expectancy in plants, ability for people to fall asleep, reproduction of wildlife and more are all being tampered with. It is a large issue to many cities but, there is a way to help the issue. LED lights with amber color instead if white lights!

  • PedroM-del1
    12/05/2017 - 05:06 p.m.

    Thats nice and all but i'd like if it were a shorter article. but after i read ill get back to you.

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