The Empire State Building, the Eiffel Tower, Beijing’s Forbidden City, and hundreds of other world landmarks will be abruptly blacked out Saturday night.

But the 60-minute power outages—scheduled for 8:30 to 9:30 p.m., local time—won’t be the results of a terrorist plot, natural disaster, or massive solar flare. They’re all part of Earth Hour 2011.

(See before-and-after Earth Hour pictures from past years.)

The organizers behind the 6th annual Earth Hour urge people to turn off lights and other nonessential appliances in a symbolic show of support for action against climate change and for energy conservation in general.

In 2010, 128 countries and territories took part in Earth Hour. Eighty-nine national capitals participated, as did nine of the world’s ten biggest cities, thousands of other communities, countless businesses, and hundreds of millions of individuals, according to WWF, the international conservation nonprofit, which organizes Earth Hour.

We only have one planet.  You can help protect it. Participate in the world’s largest single campaign for the planet: Earth Hour. It starts by turning off your lights for an hour at 8:30 pm on March 31, 2012 in a collective display of commitment to a better future for the planet.  Think what can be achieved when we all come together for a common cause.

Visit their site HERE to found out more ways to get involved