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Fotografije dana
![Chicago at night. In an average year the U.S. uses 120 terawatt-hours of energy, enough power to meet New York City’s total electricity needs for two years.](https://gdb.voanews.com/1b7e97da-93f4-4129-be3a-13da4aeed0d3_w1024_q10_s.jpg)
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Chicago at night. In an average year the U.S. uses 120 terawatt-hours of energy, enough power to meet New York City’s total electricity needs for two years.
![Lamps decorate a building in Washington, DC, sending the light skyward. (Jim Dougherty, International Dark Sky Association)](https://gdb.voanews.com/78ee528e-2fa5-4ce3-a551-42446019fef9_w1024_q10_s.jpg)
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Lamps decorate a building in Washington, DC, sending the light skyward. (Jim Dougherty, International Dark Sky Association)
![Shielded light directed downward improves visibility of U.S. Capitol at night. (Jim Dougherty, International Dark Sky Association)](https://gdb.voanews.com/18d3b0e4-c9f8-4346-b8d0-d12ddf5eb927_w1024_q10_s.jpg)
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Shielded light directed downward improves visibility of U.S. Capitol at night. (Jim Dougherty, International Dark Sky Association)
![A gas station with excessive, unshielded lights. (Pete Strasser, International Dark Sky Association)](https://gdb.voanews.com/47976508-f601-4eb3-97ca-8845a484e1f8_w1024_q10_s.jpg)
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A gas station with excessive, unshielded lights. (Pete Strasser, International Dark Sky Association)