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Use of too much artificial light and having the lighting aimed up into the sky where it does no good for anyone. It is also called pollution when it shines any place anyone does not want it, such as flooding over wide areas onto other people's property and shining into the windows of their houses. It is a result of too many people, too much wasted energy, and improper installation.

It can be improved by shielding the outdoor lighting to prevent upward light rays (as easy as painting the tops of light globes black or installing shields made for the purpose). Good neighbors will be sure their lighting is not leaving their property either up or out and will ask the electric company installing the lighting to use appropriate shields.

Many people believe that having a lot of light at night improves their security and prevents vandalism. This has been proven to be a misconception.

Don't listen to the utility companies when they try to sell you giant night lights to protect you, or even put them up for free...why do you think they do that? To sell you more wasted energy is why.

What it does is provide lighting for trespassers and thieves to see what they are doing better. It also allows shadows to be created for them to hide in. I'd much rather they not be able to see where they are going well, so they trip over things and make noise for me to know they are lurking.

There have been studies that tested whether added lighting at vandalized locations at night prevented the continued vandalizing. It, instead, has proven to increase that...vandals like to see their dirty deeds and want others to see them do it, too. When lights at night in some Texas school systems were turned off, they had significant reductions in vandalism of the school property.

Answer:

An indirect cause of light pollution is the need for visibility at night, for reasons of safety. The direct cause is the solution to this problem: man-made lights.

Answer:

Much of the light pollution problem (at least for astronomers where the "waste" light obscures their viewing of the sky) is the poor design of city light. Many existing city street lights direct a portion of their light skyward where it serves no purpose. Some cities (like Calgary) are installing more purposeful light sources with reflectors to keep the skies dark. To keep the astronomers happy and the streets better lit (to aid the citizens and detract from criminal activities).

A second form of light pollution, interestingly enough, impacts mink breeders. The sex of minks determines the value of their pelts (males are better). However the sex ratio in litters is impacted by the quality of light in the breeding areas. Some cities have installed bluish lights on roads near mink farms. This color of light predisposes mink females to have female kits. Mink farmers often advocate for yellow or pinkish lights near their farms. In this case the cause of the light pollution is economic and a desire for better use of the lights for humans to make driving safer.

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