Land contamination typically arises from historical activities, which occurred at a time when there was less awareness or regulation to control or clean up substances entering our environment.
Artificial light is an important part of modern life. It has many uses including illumination of streets, roads and hazardous areas; for security lighting; to increase the hours of usage for outdoor sports and recreation facilities, to enhance the appearance of buildings at night. The increased use of lighting, however, can cause problems. Light in the wrong place, of the wrong type or at the wrong time can be intrusive.