Cities and Monuments Switch Off for Earth Hour
Sydney's Opera House and Harbour Bridge plunged into darkness Saturday to mark Earth Hour, as global landmarks began dimming their lights to draw attention to climate change.
Millions of people from some 170 countries and territories are expected to take part in the annual bid to highlight global warming caused by the burning of coal, oil and gas to drive cars and power plants.
The event, which originated in Sydney, has grown to become a worldwide environmental campaign, celebrated across all continents.
Conservation group WWF, which organises Earth Hour, said great strides had been made in highlighting the dire state of the planet.
Alice Popkorn