Millions of people from 178 countries and territories were expected to take part in the event this year, with monuments and buildings such as the Eiffel Tower, Taipei 101 and the Empire State Building plunging into darkness for 60 minutes from 8:30pm local time.
Mumbai, India
Consuming a trillion megawatt hours of energy per year, India's focus for Earth Hour is on the sun and leaps towards solar energy.
In Mumbai, an estimated 40 per cent of electricity demand is for cooling, which contributes to frequent, significant blackouts.
Bangkok, Thailand
Thailand has led the way with one of the first APEC "low carbon model towns" on the island of Samui, and this year its Earth Hour message was a push for a "zero-carbon city".
While that desire is impossible, even in the distant future, individual responsibility has long been the aim of environmental campaigns.
Singapore
Severe peat fires in nearby Indonesia caused choking haze last year across Singapore and Malaysia, that Indonesia's Widodo Government estimates cost $45 billion in lost productivity.
Singaporeans this year on Earth Hour were asked to call for the implementation of a Peatland Moratorium in Indonesia.
For its part, new structures in the city state's landmark Marina Bay are required by law to contribute to efficient building design and energy conservation.
Shanghai, China
As the world's factory, with the world's largest population, China consumes more than one-quarter of all of the world's energy.
But projects such as the city of Anshan's capture of 1 gigawatt of waste heat from a steel plant in the city to bring back into the system is lateral thinking.
Its focus this year for Earth Hour is sustainable consumption.
Sydney, Australia
After a year of devastating bushfires right across the country, Australians are being asked to address climate change.
Among the top 20 list of nations with the highest energy consumption, Australia has the smallest population.
Moscow, Russia
Last year, WWF Russia held a campaign Time to Think Differently, which lobbied for a freeze on environmentally hazardous and costly projects in the Arctic.
Its aim is to have the Russian President impose a 10-year moratorium on the development of new oil fields in the Arctic shelf.
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