Even on an isolated island with very little artificial light, a nesting beach can still be affected by light pollution, as seen in the above photo (photo by K. Levasseur). Light from mainland Antigua is approximately 2km away, glowing behind the beach.
Even the faintest light on a dark night can disorient sea turtles, especially hatchlings, who emerge from the sand typically at night and crawl towards the lightest horizon to find the sea. On a natural beach unaffected by artificial lighting, the lightest point on the horizon is that over water, opposite dark dunes and vegetation backing the beach.
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