During this hour, people around the globe will turn out their non-essential lighting in what will be the largest climate event in history.

From Amman to Warsaw, city skylines will go dark for one hour as individuals, businesses, government buildings, schools and major landmarks turn out the lights.

Who can participate? Anyone! Individuals, businesses, schools, organizations...you name it! If you have a light switch-turn it off for this one hour. Earth Hour's goal is 1 billion participants in 1000 cities around the world.

Want to join us? Sign up to participate and be counted! Visit www.EarthHourUS.org and click on the orange "Join Now" button.