Light Pollution and Wildlife Welfare

Artificial light at night disrupts wildlife behavior, navigation, and reproduction. Reducing light pollution improves welfare for many species while also benefiting human health and astronomy.

Key Facts

80 percent of people globally live under light-polluted skies
Sea turtle hatchlings navigate to the ocean using the brightest horizon, and artificial lights disorient them
Migratory birds use celestial navigation that artificial lights disrupt causing millions of collision deaths
Light pollution suppresses melatonin in nocturnal mammals disrupting sleep and immune function
Reducing light pollution through fixtures, timing controls, and blue-light filtering benefits multiple species

Welfare Considerations

Artificial light at night creates pervasive welfare harm for wildlife species whose behavior evolved in response to natural light cycles. Sea turtle hatchlings are disoriented by beachfront lighting and move away from the ocean rather than toward it, dying from exhaustion or predation. Migratory birds drawn toward lit buildings and towers collide with them in millions annually. Nocturnal mammals experience suppressed melatonin that disrupts sleep, immune function, and reproduction. Insects drawn to artificial lights exhaust themselves circling light sources. These harms are preventable through shielded downward-pointing fixtures, motion-activated lighting that reduces unnecessary illumination, warm-spectrum lights that attract fewer insects, and darkness ordinances in environmentally sensitive areas.

What You Can Do

Replace outdoor lighting with downward-pointing shielded fixtures on warm-spectrum LEDs
Use motion-activated lighting that turns off when not needed
Support dark sky ordinances in your community particularly near wildlife habitats
If near sea turtle nesting beaches, turn off or shield beachfront lights during nesting season