In a gesture to combat global warming, more than 16,000 offices and tourist sites across Japan went dark on the evening of June 21.
The facilities switched off lights from 8 p.m. to 10 p.m.
Lights were also dimmed at the 634-meter Tokyo Skytree, which opened to great fanfare last month.
The environment ministry is behind the event, which started in 2003.
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