Marine light pollution
Two million square kilometres of the world's oceans and 22% of coastlines are exposed to light pollution from offshore infrastructure and coastal towns and cities – together they form artificial skyglow that can expand the impact of light pollution to hundreds of kilometres offshore.
Artificial light at night (ALAN) is of growing concern as a pollutant to our seas. It disrupts the natural patterns and biological processes of marine life, including those that support critical ecosystem services. This includes animals' ability to see their environment – to hunt, hide, communicate, navigate, grow, time important events and reproduce.
The impacts of light pollution on the night sky, astronomy and land-based ecosystems are well studied – but until just over 10 years ago, the full extent of ALAN in our coastal waters, seas and oceans was unknown.