Toggle Nav

World Wildlife FundAction Center

Golden Gate Bridge without lights © John Storey / WWF-US

Earth Hour

Saturday, March 28 at 8:30 to 9:30 PM local time

Join hundreds of millions of people around the world and turn off your lights for one hour to show your commitment to climate change action now. It's time we speak up and demand a better future for our planet.

people have signed up so far. Will you join them?

Count me in for Earth Hour!

Countries around the world are committing to reduce their carbon emissions in an effort to work toward a new global agreement to tackle climate change. Now is the time to raise our voices and demand strong action from world leaders.

What starts as a simple flick of the light switch for Earth Hour brings us all together in a collective display of our commitment to creating a better future for the planet. We need your help to ensure our commitment is stronger than ever and seen all around the world.

Turn out your lights for one hour on Saturday, March 28 at 8:30 pm local time and take a stand against climate change. Can we count on you?

Learn more about Earth Hour | See how Earth Hour is celebrated around the world.

View all the cities, business, and landmarks participating this year.

Tell your friends

Earth Hour 2015 is on its way to becoming the largest display for climate change action ever. With your help, we can get everyone to join us—invite your friends, family, and colleagues to join you and take action for a healthy, thriving environment today.

Do you represent a business or city?

For Businesses

Show employees and customers you're supporting Earth Hour and contributing to global environmental change.

Sign Up for Earth Hour

For Cities

From the beginning, cities and towns across America have enthusiastically embraced Earth Hour—turning off lights in government buildings and urging their citizens to participate.

Sign Up for Earth Hour


*Required fields

If you take action and have not already registered, you will receive periodic updates and communications from World Wildlife Fund.


Count me in for Earth Hour!

Dear [Decision Maker],

Count me in for Earth Hour!

[Your Name]
[Your Address]
[City, State ZIP]


Our privacy policy will be changing. Read the new policy, which takes effect March 30.