Not everyone wants to see the light

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A view over the city of Zurich, February 2009 Keystone

Skyglow from the city of Zurich lights up the sky over the village of Tagelswangen, April 2009 Keystone

Fog and light pollution over the city of Geneva, January 2010 Keystone

The illuminated Turbine Square in Zurich, February 2008 Keystone

Swiss Prime Tower in Zurich, November 2012 Keystone

Night-skiing in Arosa, canton Graubünden, February 2008 Keystone

Insects swarm in front of a light in Gösgen, canton Solothurn, May 2011 Keystone

Stars above a sea of fog seen from the Fronalpstock mountain in canton Schwyz, March 2011 Keystone

LED street lights in Igis, canton Graubünden, January 2013. The first project of its kind in Switzerland massively reduces the energy required as well as light pollution Keystone

Christmas time in Bern's Old Town, December 2011 Keystone

Neon signs in Hong Kong, which according to a study by the University of Hong Kong has the worst light pollution in the world Keystone

Office blocks in Montreal. Some cities in North America have introduced standards to limit outdoor night lighting AFP

Light pollution seen from space Keystone/AP/NASA

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These striking images of light pollution reflect a form of environmental damage that has serious consequences for humans and wildlife.

(Images: Keystone, picture editor: Ester Unterfinger)