EcoWatch: Light Pollution: The Dangers of Bright Skies at Night

“Science shows links between artificial light and eye injury, sleeplessness, obesity and in some cases, even depression. A US study on shift workers from 2007 even makes a connection with breast cancer. It is all related to melatonin, a hormone that is released when it gets dark….

“It’s not only humans that need a natural day-night rhythm. Wildlife also struggles to adapt to the use of artificial light at night. Corals, for example, don’t reproduce as usual, migratory birds can lose their sense of orientation, and, rather than walking towards the sea, newly hatched turtles have been found walking inland, where they die…

“Insects are also affected. One study suggested that an estimated 100 billion nocturnal insects die in Germany each summer as a result of artificial light. Usually reliant on the moon for orientation, the critters become so distracted by bright streetlamps for example, that they fly around them all night. They then die from exhaustion, are too weak to reproduce or become easy prey for predators…

“With fossil fuels still the main source of global electricity production, the unnecessary use of light at night also contributes to air pollution and climate change.”