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Light pollution

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fadwa alateeq

on 12 May 2015

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Transcript of Light pollution

Light pollution
What is light pollution
SKY-GLOW is when light pollution unable humans and animals from seeing the stars. These are a few examples of the bad results that's caused by sky-glow: Birds need the stars to migrate and when there is sky glow lots of birds can die from flying in circles and dying from exhaustion. It also stops astronomers from seeing small objects in space and beyond
Light pollution is a dangerous and damaging form of pollution that harms us.And expose us to various health issues. Not only does light pollution affect us, it affects the animals living around us as well.
Light pollution is one type of pollution. It's defined as a bad effect as a result of man-made lights. which means too much light effects badly on plants, humans and several species.
Most people don't know anything about Light pollution and half of them doesn't know or even care how much it costs every year!
Types of light pollution
How does light pollution affect animals living in our environment?
Light pollution affects animals by disrupting their natural rhythms (night time and daytime), plus research has shown light pollution changes the behavior of nocturnal animals.
In the ocean, the animals that are most affected by light pollution are turtles. Bright lights near the shore discourages female turtles to come to shore and nest. As well as that, new baby turtles need darkness to orient themselves, but with loads of bright lights near the shore they lure the baby turtles away.
Bright lights from beach resorts can lead to Sea Turtle hatching disorientation!
Sea turtle hatching use various cues to find the ocean.
such as:
Such as:
Waves crashing on the beach

Slope of the beach

Light source
Moonlight Reflecting off the ocean.
Hatching use the reflection of the moon's light to find the ocean
Dark silhouettes drive hatching away.
In 2007, Slovenia became the first country to enact national law against light pollution.
Murdoch Independent, Updated 2012, City Of Lights Too Bright, 13-8-2012,http://www.murdochindependent.com.au/city-of-lights-too-bright/
National Geographic (Sharon Guynup), Updated 2012, Light Pollution Taking Toll on Wild Life, Eco Group Says, 10-8-2012, http://news.nationalgeographic.com/news/2003/04/0417_030417_tvlightpollution.html
ABC Science, Updated 2012, How Far Away From City Lights do you Need to be to Escape Light Pollution (Perth), 14-8-2012, http://www.abc.net.au/science/articles/2009/03/26/2527197.htm
Curiosity! Discovery, Updated 2012, How does Light Pollution affect humans? 22-8-2012, http://curiosity.discovery.com/question/how-light-pollution-affect-humans
Florida Atlantic University, Department of Physics, Unknown Update date, Prevent Light Pollution, 23-8-2012,http://physics.fau.edu/observatory/lightpol-prevent.html
Light pollution is a global issue
And people around the world are beginning to react
-the aim is to prevent lighting above the horizon and limit unnecessary brightness

-large energy savings are expected to accompany increases in biodiversity
Light pollution is a harmful and destructive to not only humans but animals as well. By doing everyday things like switching your lights off when they aren't being used can make the difference to our future.

Glare light affects people in two types:
The first type is disability glare it makes your vision bad because of too many lights.
The other type is Discomfort glare it's when there is too many lights that gives you a slight headache.

It's when there is a of personal or public light that is not wanted. For example street lighting going into somebody’s bedroom.
Light pollution may be worsen than Air pollution
A recent study presented at the American Geophysical Union found that bright city lights exacerbate air pollution by interfering with nightly cleansing chemical reactions. An important chemical, nitrate radical (NO 3 photolysis)—a form of nitrogen oxide only present in darkness—normally breaks down damaging chemicals that create smog. Recent measurements taken over Los Angeles have shown that, like sunlight, city lights suppress the nitrate radical—reducing night cleansing by up to 7% and increasing the following day’s ozone pollution precursor chemicals by up to 5%.
Light pollution is
a risk factor for cancer to people
-a disturbance to animals
-a waste of energy, resources, and money
-a security risk to your property
-obscures our view of the wondrous night sky.

Uplight is a wasted light, pure and simple. Light that goes directly up into the night sky and "lost in space" that serves no useful purpose
Clutter is a bright, confusing, ugly and excessive groupings of light sources, commonly found in over-lit urban areas.
Most people think that electricity-powered lights are modern convenience, and couldn't’t imagine living without them.Not aware that Streetlights can confuse newly hatched sea turtles that rely on starlight reflecting off the waves to guide them from the beach to the ocean. They often head in the wrong direction.
Turning on so many lights may not be necessary: researchers estimate that over-illumination wastes the equivalent of about 2 million barrels of oil per day. Light pollution also makes it difficult for astronomers, both professional and amateur, to properly see the stars.
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