Cities dim lights for environment

Towns and cities around the world are turning out the lights for an hour, to highlight the threat of climate change.

"Earth Hour" began in Sydney at 2000 local time (0900 GMT), when lights went out on landmarks like the Opera House and Harbour Bridge.

Bangkok, London and Chicago are among cities due to follow suit when clocks reach 2000 local time.

The initiative began in Sydney last year but now involves 35 countries.

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