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Light Pollution

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Hannah Brown

on 26 February 2013

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Transcript of Light Pollution

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli What is light pollution? Involvement and Progress Glare: excessive or uncontrolled brightness surrounding a light fixture. (ex., street lamps, sports stadiums)

Sky Glow: haze-like glow above many urban cities caused from excessive lighting or poorly aimed lights. (ex., billboard signs, urban areas)

Trespass: light is cast where it is not desired to such as in a neighbors yard or a street light in a bedroom window. (ex., flood lights, security lights) What are the types? Light Pollution causes adverse effects in:
Human Health
The Environment
The Economy Whats The Big Deal? How to fix it? Many civic orginazitions are beginning to get involved in the fight against light pollution.
mandated lighting ordinances.
Michigan night sky park
Tuscon is the gold standard The Economy The Environment Health effects "a broad term referring to excessive or obtrusive artificial light caused by bad lighting design" Citations Gallaway, Terrel, Reed N. Olsen, and David M. Mitchell. "The Economics of Global Light Pollution." N.p., Aug. 2009. Web. 18 Dec. 2012. Animals:
normal functions such as feeding, reproduction, migration and sleeping are disrupted
sea turtles Plants:
disrupts flowering patterns and causes plant cells to keep growing they should stop for the coming winter. Light pollution disrupts natural circadian rhythm of humans, causing:
sleep disorders
abnormal cell growth "Its costing the Earth to light the sky" Inefficient lighting costs the government 3-5% of national budget each year (Reduce Light Pollution). Efficient lighting pays for itself and ultimately saves money. There are 4 easy fixes to light pollution: Prevent the continuation of bad lighting
use only efficient and proper lighting in future building projects. Retro-fit already installed inefficient lights:
directs all light from a light source to its proper target. Redirect lighting:
point existing lights down
less light escapes into the sky. Spread the word!
the main obstacle to overcoming light pollution is a lack of awareness. B.R.A.S. Good Lighting Award
Bass Pro Shops in Denham Springs. International events:
Globe at Night
Earth Hour
The Great World Wide Star Count Interesting Statistics Cost to operate a 150 watt bulb:
Dusk-dawn every night
$114.90 per year. Motion Detection:
About 1 hr per night
$10.06 per year 45% of light pollution is caused by residential lighting --"The Economics of Global Light Pollution" AMA officially acknowledges light pollution as harmful to human health and safety.
glare from roadway, property, and other artificial lighting sources that can create unsafe driving conditions, especially for older drivers" (American Medical Association). "Parshield.com." Parshield.com. N.p., n.d. Web. 03 Feb. 2013.
"Light Pollution: Adverse Health Effects of Nighttime Lighting." N.p., n.d. Web. 27 Oct. 2012.
By: Hannah Brown
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