Light pollution and its consequences

In short: Light pollution refers to excessive or misdirected artificial lighting that disrupts the natural day-night rhythm. It affects people, animals, and the visibility of the night sky alike.

In more detail: In many large cities, the night sky is now so brightened that barely any stars remain visible.

In detail

• Effects on animals: Migratory birds, insects, and many nocturnal species have their orientation and reproduction disrupted by artificial light.
• Insect decline: Light sources attract nocturnal insects, which often die exhausted or fall prey more easily to predators.
• Human health: Excessive artificial light at night can disrupt the sleep-wake cycle and melatonin production.
• Astronomical observation: Light pollution significantly hampers both amateur astronomy and professional research.
• Wasted energy: Misdirected or unnecessarily bright outdoor lighting wastes considerable amounts of energy.
• Countermeasures: Shielded lamps, warm-white light, and timed lighting significantly reduce light pollution.
• Dark sky reserves: Special protected areas deliberately preserve dark night skies for astronomy and nocturnal wildlife (weltbevoelkerung-und-megastaedte, voegel-und-vogelzug).