Singapore will be in the dark tomorrow night, but it is all for the cause of a brighter future.

More than 10,000 people and 450 companies, hotels, malls and schools will switch off their lights for an hour at 8.30pm, as part of the global Earth Hour energy conservation effort.

At least 2,700 cities in 84 countries have committed to mark Earth Hour, an initiative by the World Wide Fund for Nature (WWF) to raise awareness of climate change issues and which was launched two years ago.

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