Since time immemorial, humanity has drawn inspiration from our view of the stars. Yet for the majority of people today, the heavens have become obscured by human-made light at light.

More than 99% of European and North American residents live under light-polluted skies, and for a third of people worldwide the Milky Way is entirely obscured (Falchi et al. 2016).

Over millennia, Nature has evolved according to the cycles of day and night; living things are regulated by an internal biological clock – the circadian rhythm. But since the invention of electric light in the 1800s, humans have been interfering with the dark. Today, light pollution triggers problems for plants, insects, animals and humans. There is a critical need for light pollution policies that incorporate health, the protection of ecosystems, and the preservation of cultural heritage.

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