Light pollution: A review of the scientific literature

Light pollution is the consequence of elevated lighting emitted by human-made artefacts to the lower atmosphere. Recently, there have been major advances in the assessment and mitigation of light pollution impacts on humans and the natural ecosystems. Severe negative impacts of light pollution have been highlighted while very few mitigation measures have been implemented. People (scientists, policymakers or stakeholders) interested in light pollution may not have a holistic perspective of the problem, and also there is a need for incorporating social and natural dimensions. Therefore, the main goal of this paper is to review the literature on light pollution using ISI Web of Science by paying attention to the (i) type of publication, year and journal; (ii) impacts on specific elements; (iii) location and (iv) methods used. Our results indicated that the elevated number of papers come from a diverse range of disciplines, methods, places and scales. It is clear that light pollution is getting enough attention from the scientific community but decisions on the implementation of mitigation measures are left with the stakeholders, ordinary inhabitants, policymakers and politicians. Nevertheless, light pollution is having impacts on the health of humans and the natural ecosystem as perceived by experts and inhabitants having divergent perspectives. Thus, light pollution is multifaceted but difficult to be faced, mitigated and not holistically understood. This review paper groups the total impacts of light pollution on the Earth presents some contradictory results, summarises mitigation measures, and provides specific future research directions.