What is light pollution？It is an umbrella term for representing all forms of misused artificial light.In the broad sense，light pollution is defined as the unwanted change of natural light levels in the environment due to effects of man­made light sources.Human activities are directly or indirectly responsible for this form of pollution.

　　The obvious cause of light pollution is to use external lighting products inappropriately.It can be apartment light，office lighting，car headlights，station lights，streetlights and many more.With reference to these many contributing sources，it won’t be wrong to say that is an outcome of industrial civilization.

　　Light pollution is harmful to both plants and animals.Upon studies，it is found that obvious effects are observed in the behavior of nocturnal animals.Needless to mention，bright light at night makes it difficult for these animals to hunt，wander and perform their regular activities.

　　Light pollution is directly or indirectly responsible for causing several diseases.Its effects are related to disturbance in the physical rhythm.It contributes to risks of developing cancerous cells.Light pollution is nothing less than a threat to human health.

　　You have already seen the negative effects of light pollution on plants，animals and human health.Apart from this，the actual cost of misused light is estimated to be millions of dollars every year.After all，fossil fuels are used for producing maximum electricity.

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