In 2007 Sydney started the first ever Earth Hour event, by persuading as many businesses and individuals as possible to switch off their lights.
This year the city was almost completely engulfed in darkness; over two million individuals and more than two thousand businesses took part.
More top news
Gamers have been given a taste of what Final Fantasy XV will look like after developer Square Enix released a new trailer.
ITV Central Correspondent Gareth Owen looks at how the decision for Scotland to remain part of the UK will affect the Midlands.
One iPhone 6 customer has learned the hard way that speed is not always of the essence when attempting to liberate his new Apple gadget.