Before and after pictures: World marks Earth Hour 2018
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A combination picture shows the India Gate war memorial before (top) and after the lights were turned off for Earth Hour in New Delhi, India.
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The Stupa of Enlightenment, a holy monument constructed of granite, at the Buddhist Centre, before (bottom) and after the lights were switched off for Earth Hour, in Krasnoyarsk, Russia.
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A combination photo shows the "Puente Nuevo" (New Bridge) in the daytime (top), at night (C) and during Earth Hour in Ronda, near Malaga, Spain.