Feel part of something brilliant. Sign up to say you'll join millions of people switching off for a brighter future.
To sign up as a school, please use our schools sign up form
To sign up as a business, please use this form.
To sign up as an organisation, please use this form.
By providing your email address, you'll be agreeing to receive emails from us - we won't share your details and you can unsubscribe at any time.
If you provide your mobile we'll send you special Earth Hour content, text reminders and contact you to tell you more about our work. You can opt out at any time.