They may look pretty, but outdoor lights for holiday decorating or for simple illumination are considered "light pollution" by the international citizen-science campaign Globe at Night. According to the nonprofit, holiday lighting is often so bright that it can be seen from space. It also can obscure the stars in the sky, which nocturnal animals and birds use to navigate. It's also a big waste of energy. If you must have holiday lighting, the best thing you can do is to minimize it and turn the lights off before you go to bed.
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ANDREWS MCMEEL SYNDICATION