HomeEuropean retailers turn off lights, cut opening hours to save energyFILE PHOTO: The logo of Austrian supermarket chain Spar is

FILE PHOTO: The logo of Austrian supermarket chain Spar is

FILE PHOTO: The logo of Austrian supermarket chain Spar is seen behind a traffic sign at a shop in Vienna, Austria, July 11, 2016. REUTERS/Heinz-Peter Bader/
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