dnb_land_ocean_ice.2012.3600x1800.jpg (3600×1800)

http://www.accuweather.com/en/weather-blogs/astronomy/interesting-documentary-about-light-pollution/68253

What do these images tell us about cities and urbanization?  Why?

kahoot.gif (1200×1200)

https://play.kahoot.it/#/k/96c9e022-1433-486c-88ba-4179720cd623

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