The world will go dark on Saturday night beginning from New Zealand's remote Chatham Islands and then spreading to thousands of cities, towns, and landmarks in observance of Earth Hour.

On Saturday, the World Wildlife Fund is promoting “Earth Hour,” which is the WWF’s plea to people around the world to turn off their lights at 8:30 p.m. local time for an hour in order to raise awareness for action on climate change.

The slogan for the event is, “Your light switch is your vote,” and they claim that, “switching off your light switch is a vote for Earth,” according to their site. Their goal is to inspire one billion people worldwide to participate.

About 2,800 cities in 83 countries — including 250 in the United States — had signed up, according to Dan Forman, a spokesman for World Wildlife Fund.

Some symbolic monuments of large cities have also pledged to participate including the St. Louis Gateway Arch, the Golden Gate Bridge, the Eiffel Tower, New York City's Empire State Building, Egypt's Great Pyramid of Giza and many other iconic structures.

Even companies are getting involved with Coca-Cola offering to turn off its big signs around the world, including a marquee in New York's Times Square.

Meanwhile, United Nations Secretary-General Ban Ki-moon recently pledged his support for Earth Hour, saying it has the potential to be the largest demonstration of public concern about climate change ever attempted.