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This picture shows people standing next to candles arranged to read... News Photo 164411730Avenue,Candle,Dark,Demonstrating,Earth Hour,Environmental Issues,Global Warming,Habib Bourguiba,Horizontal,Neat,Night,North Africa,Part Of,People,Picture,Rally,Reading,Showing,Standing,Tunis,Tunisia,UnderwaterPhotographer AFPCollection: AFP 2013 AFPThis picture shows people standing next to candles arranged to read 'Tunisia' in the Habib Bourguiba avenue after submerging into darkness as part of the Earth Hour switch-off in Tunis on March 23, 2013. Organisers expect hundreds of millions of people across more than 150 countries to turn off their lights for 60 minutes on Saturday night -- at 8:30 pm local time -- in a symbolic show of support for the planet. While more than 150 countries joined in last year's event, the movement has spread even further afield this year, with Palestine, Tunisia, Suriname and Rwanda among a host of newcomers pledging to take part. AFP PHOTO / SAFA LAAMIRI (Photo credit should read safa laamiri/AFP/Getty Images)