Lights went off around the world as landmark buildings and ordinary homes flipped their switches while the annual "Earth Hour" circled the planet in what was dubbed the world's largest voluntary action for the environment.
In Paris a minute's silence was observed for Japan as the city of light went dark, with illuminations switched off at the Eiffel Tower, Notre Dame cathedral, City Hall, opera houses and many bridges, fountains and public places.
Sydney's Opera House was the first of many global landmarks to go dark as the event got under way, as hundreds of millions of people prepared to follow suit to enhance awareness of...more.
