Two women light candles after the building lights were switched off for the Earth Hour environmental campaign in Dubai on March 24, 2018.
Earth Hour, which started in Australia in 2007, is set to be observed by millions of supporters in 187 countries, who will turn off their lights at 8.30pm local time in what organisers describe as the world's "largest grassroots movement for climate change". / AFP PHOTO / Giuseppe CACACE

Earth Hour 2018: Lights out across UAE as Earth Hour is marked