It's an annual worldwide event organised by the World Wide Fund for Nature which encourages people to turn off non-essential lights for 60 minutes.
The idea is to save energy during that hour, while also encouraging people to be more wary about how much electricity they use.
In Philippines, kids and youth joined hands at the awareness event as conservation of environment became the talking point; while people in Japan and Singapore also participated to mark the event.
This year, Earth Hour will take place on Saturday 24 March, from 8.30pm to 9.30pm. "Let us join the entire world as it shines a light upon the importance of climate action by going dark", he said. "Earth Hour highlights the power of each individual, and what we can achieve if we do it together".
But the people behind Earth Hour said the report doesn't reflect the stated aims behind the event, and have problems with conflating a symbolic gesture with energy savings.
Every year this event is managed by the WWF.
It's easy to think that you can't make a difference, but according to WWF Thailand, Bangkok's electricity usage reduced by 73.34 megawatts during the hour - saving 41.6 tonnes of carbon monoxide from being produced. The support of Earth Hours and WWF's work more broadly has influenced climate policy, facilitated climate-friendly laws, such as a ban on plastic in the Galapagos Islands and supported the world's first Earth Hour forest in Uganda.
Sydneysider Dianna Ali, who was having dinner with family as the lights went off in the city, said the initiative had made her more aware of the impact of her lifestyle on the planet's health.
The Crown utility says B.C. residents cut power use during Earth Hour by just 0.3 per cent a year ago - recording just 15 per cent of the energy savings achieved in 2008.
Other global landmarks that will take part include New York's Empire State Building.
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This is because the each state has its own different set-up on all levels socially, financially and geographically. Each state has populations equivalent to nations with universal coverage hence size can never be a limiting issue.