Light Pollution
Issue no. 60
The night sky is a global natural asset worth trillions, and we’re throwing away trillions of dollars of its value every year by lighting it up unnecessarily. Across fields, the pattern holds that light pollution shifts biology and drains value in systems built for night…and the planet keeps getting brighter. But light pollution is one of the easiest environmental problems to fix and mitigation would simultaneously save energy costs, improve human health, and restore ecosystem function.
Outdoor Brightness Links to Alzheimer Patterns in the US
Robin M Voigt et al map satellite nighttime light onto Medicare data. Higher light zones show higher Alzheimer prevalence and the strongest link appears in adults under 65.
https://doi.org/10.3389/fnins.2024.1378498
Light Pollution Cuts Global Ecosystem Service Value
Sharolyn J Anderson et al apply a global light ratio metric to landcover valuations. Brightest regions lose about forty percent of ecosystem service value and the annual global loss reaches USD 3.4 trillion.
https://doi.org/10.3390/rs16142591
Health and Ecology Decline as Nights Brighten
Derrick Wayne Thomas et al review evidence that artificial light at night harms humans and wildlife while offering no measurable benefit. Basic controls reduce exposure by limiting place time amount and color.
https://doi.org/10.1016/j.fhj.2025.100470
Satellite Trails Threaten Space Telescope Imaging
Alejandro Borlaff et al forecast contamination levels for major orbital observatories. Completed satellite megaconstellations would mark a third of Hubble images and hit almost all exposures for newer missions.
https://doi.org/10.1038/s41586-025-09759-5
Turtle Hatchlings Fail on Bright Beaches
Imed Jribi tracks loggerhead nesting in Tunisia. At lit beaches every hatchling disorients and many die while darker sites show minimal disruption.
https://doi.org/10.5455/OVJ.2025.v15.i10.51
Seaweed Reproduction Shifts Under Artificial Light
Emma Moyse et al measure ripeness cycles in fucoid macroalgae. High-light sites push summer reproductive timing into winter altering coastal phenology.
https://doi.org/10.1016/j.envpol.2025.127155