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Calgary, AB. Above in 2010 (orange sodium lamps); below in 2015 (white LED lamps).
Photographs of Calgary, Alberta, Canada, taken from the International Space Station. Above: In 2010, residential areas are mainly lit by orange sodium lamps. Below: By 2015, many areas on the outskirts are newly lit compared to 2010, and many neighborhoods have switched to white LED lamps. Credit: NASA's Earth Observatory/Kyba, GFZ.
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