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For the last hundred years, pollution from artificial light has seeped into the night sky and wildlife are suffering. While light pollution is still growing at a rate of 10% every year, insects, birds and turtles are all affected and the health consequences on human beings of artificial light are being increasingly documented. Now, DarkSky International is leading the global effort to protect areas from its effects. CNN travels to the West Penwith Dark Sky park with astrophotographer Aaron Cherrie to witness the beauty of a truly dark night sky.