Earth Hour 2027 Countdown

Earth Hour, held on a Saturday evening toward the end of March, is a global WWF initiative in which millions of people and thousands of landmarks switch off non-essential lights for one hour as a shared gesture of care for the planet.

History

Earth Hour began in Sydney, Australia, on 31 March 2007, when WWF-Australia, together with media and creative partners, invited the city to switch off its lights for a single hour. The response exceeded every expectation: an estimated 2.2 million residents and more than 2,000 businesses took part, and the Sydney Harbour Bridge and Opera House went dark against the night sky. The organisers had wanted a simple, positive act that anyone could join, and the image of a great city dimming its lights by choice proved instantly powerful. The following year the event went international. In 2008 around 400 cities across 35 countries took part, and famous structures such as the Golden Gate Bridge, the Colosseum and Bangkok's Wat Arun joined the hour of darkness. By 2009 participation had spread to 88 countries and over 4,000 cities, and in the years since, Earth Hour has grown into what WWF describes as one of the largest grassroots movements for the environment, observed in more than 190 countries and territories. The switch-off settled into its familiar slot of 8:30 to 9:30 pm local time, rolling around the globe time zone by time zone. Over time the initiative has broadened beyond the symbolic blackout. Campaigns connected to Earth Hour have supported tree-planting programmes, conservation legislation and community climate projects in many countries. In 2023 WWF refreshed the event as "the Biggest Hour for Earth," inviting supporters to "give an hour for Earth" by spending sixty minutes on any activity that benefits the planet — from cleaning a beach to cooking a sustainable meal — alongside the traditional lights-out moment.

Meaning

Earth Hour's meaning lies in its simplicity: for sixty minutes, individuals, households, businesses and entire skylines perform the same small act at the same local time, turning a private choice into a visible worldwide statement. The darkness itself saves only a little electricity; the point is the signal it sends — that millions of people, across cultures and continents, share concern for nature and the climate and are willing to show it together. The hour is also an invitation to pause. Families eat by candlelight, friends gather under darker skies, and cities briefly rediscover their stars. In recent years the emphasis has widened from switching off to actively giving time to the planet, making Earth Hour both a moment of reflection and a gentle prompt toward everyday habits that last far beyond the hour.