Hong Kong’s neon waterfront dimmed, while in Singapore all decorative lights were switched off and non-critical operational lights lowered at Changi Airport for an hour.
The airport said the effort would result in energy savings equivalent to the total amount of electricity consumed by a four-room apartment over three months.
In Japan, which is reeling from a huge earthquake and tsunami that struck this month, several thousand people and a hotel-turned-evacuation centre in the northeast marked Earth Day.
"People in Japan will have a special feeling this year when they turn the switches off," WWF spokeswoman Hideko Arai told AFP ahead of the switch-off.
"We will not only think about climate change but also the people who need energy in the disaster-hit areas," she said. "We want to show our support for disaster victims."
The March 11 twin disaster left more than 27,000 people dead or missing and hundreds of thousands more homeless, sheltering in emergency facilities.
In Paris a minute’s silence was to be observed for Japan as the city of light went dark, with illuminations switched off at the cathedral of Notre Dame, City Hall, the two opera houses and many bridges, fountains and public places.
Another 129 French towns and cities were also taking part in EarthHour.
In Russia some 30 cities were joining in, from Petropavlovsk-Kamchatsky, the most easterly city on the Kamchatka peninsula, through Moscow to Murmansk in the far north.
Moscow was to turn off floodlighting on more than 70 buildings and bridges, including the 540-metre (1,780-foot) television tower and the 32-storey Moscow State University building.
In Athens monuments being darkened included the Acropolis, the parliament building, the presidential palace and at the temple of Poseidon near the city.
United Nations Secretary General Ban Ki-moon backed Earth Hour, urging people to celebrate the shared quest to "protect the planet and ensure human well-being".
"Let us use 60 minutes of darkness to help the world see the light," he said.
British Prime Minister David Cameron said sharing responsibility was the key to fighting climate change, describing Earth Hour as "a huge symbol of global solidarity, an inspiring display of international commitment".
Ridley said he never expected the Earth Hour movement to become so large.
"We didn’t imagine right at the beginning... it would be on the scale that it is now. And the fact that it is so cross cultural, beyond borders and race and religion," he said.
View video - Earth Hour: Vancouver Time Lapse. The lights of downtown Vancouver viewed from False Creek between 8:30 - 9:30 p.m. during Earth Hour, Saturday, March 27, 2010. |