Light pollution is unique as it is caused by man only. There is no comparable natural form of the pollution like there is with carbon dioxide. The main causes of light pollution are:
Poor Planning – The placement of signage and street lights is planned by engineers, if they do not take into account the effect placement has on the surrounding environment they can create glare, light trespass and light clutter.
Irresponsible use – You may love Christmas lights but leaving them on all night is a form of pollution, as is leaving a room with the lights still on or setting the timers on streetlamps and not adjusting the timer for the season. Not actively choosing to minimize energy waste is a huge source of light pollution.
Overpopulation – That is really a zoning issue. Too many businesses, or too many residences, grouped in one area can cause light pollution of many kinds.
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