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Light pollution is the alteration of the natural levels of darkness by anincreased concentration of light particles in the nighttime environment,resulting from human activity. Light pollution is changing in a deep way theenvironmental conditions of the night in wide areas of the planet, and is arelevant stressor whose effects on life are being unveiled by a compelling bodyof research. In this paper we briefly review the basic aspects of artificiallight at night as a pollutant, describing its character, magnitude and extent,its worldwide distribution, its temporal and spectral change trends, as well asits dependence on current light production technologies and prevailing socialuses of light. It is shown that the overall effects of light pollution are notrestricted to local disturbances, but give rise to a global, multiscaledisruption of the nighttime environment.

Artificial light at night: a global disruptor of the night-time environment