When and where did the concept of Earth hour begin?

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When and where did the concept of Earth hour begin?

1. In April, 2008 in Tokyo, Japan
2. In June, 2007 in Christchurch, New Zealand
3. In May, 2009 in Colombo, Sri Lanka
4. In March, 2007 in Sydney, Australia

Correct Option: D

Earth Hour is a worldwide movement for the planet organized by the World Wide Fund for Nature (WWF). It was famously started as a lights-off event in Sydney, Australia in 2007. Since then it has grown to engage more than 7000 cities and towns worldwide.
Note: Earth Hour is a worldwide movement organized by the World Wide Fund for Nature (WWF). The event is held annually encouraging individuals, communities, households and businesses to turn off their non-essential lights for one hour, from 8:30 to 9:30 p.m. towards the end of March, as a symbol for their commitment to the planet. It was started as a lights-off event in Sydney, Australia, in 2007. 2017 marks the 10th anniversary of Earth Hour – the world’s biggest environment event.