Light Pollution
Ecological and astronomical degradation from artificial light at night. Encompasses sky-glow, glare, light trespass, and over-illumination; affects nocturnal species behavior, circadian regulation, observational astronomy, and energy use.
In this wiki, light pollution is treated as the ecological-impact face of nighttime-light-emissions, the same physical signal that — viewed through an astrobiological lens — functions as a terrestrial-technosignature calibration target.
Trajectory
christopher-kyba’s 2014–2022 global VIIRS DNB analysis (src-terrestrial-technosignatures-satellites-2026-04) measures a net +16% rise over the period. Regional dimming (France −33% from post-midnight streetlight curfews and LED conversion) demonstrates that regulatory and technological levers can reduce light pollution at policy-relevant scales — a useful counterweight to the prevailing “ever-brightening sky” narrative.
Mitigation levers cited
- Post-midnight streetlight curfews
- Full-cutoff fixtures (limit upward spill)
- Warmer-color LEDs (reduce blue-light ecological impact)
- Astronomy-protection zones