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.
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More than 44,000 Allied soldiers were killed at Gallipoli.
The General Data Protection Regulation will give users more access to their personal data and more greatly punish mishandling.