Among the most radical transformations wrought by modern humans is artificial light: not just in homes but throughout the built environment, turning night into semi-day across vast swaths of the world. This has long been known to affect animals — newly-hatched sea turtles, for example, can become disoriented and wander towards streetlights rather than moonlight glinting on water — but the effects were somewhat mitigated by yellowish color of old-fashioned lamps. Now, however, the advent of LED lights that mimic the spectra of natural light threaten to cause a host of problems in wildlife, from circadian rhythm disruption to impaired…

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