Nighttime lights - which shine 20%-50% brighter in many U.S. cities during Christmas and New Year's - may harm wildlife, experts say. How you can help.

They light up the night on the darkest days of the year.They delight small children and let the neighbors know that you have goodwill to spare.And in the LED era, they're cheaper and more energy efficient than ever before.What could possibly be wrong with holiday lights?To some extent, those brightly twinkling bulbs are a victim of their own success.

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