Abstract
Conservation The use of artificial light at night is increasing around the world, causing both direct emissions, mostly in the vicinity of the light, and a brightening of the night sky called skyglow. In a Perspective, Gaston explains that this light is changing the activity patterns of many animal species and can even affect the timing of budburst in temperate trees. Outdoor artificial light at night may also affect human sleep patterns and human health. The ongoing shift to light-emitting diode (LED) lamps with a broader and colder light spectrum is exacerbating these problems. Science , this issue p. [744][1] [1]: /lookup/doi/10.1126/science.aau8226
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