Earth Hour is observed each year on a Saturday evening when people worldwide are encouraged to switch off nonessential lights for a full hour. In recent schedules, the event is set to run from 8:30 to 9:30 p.m. local time, with date changes year to year to align with the calendar. The purpose is to draw attention to energy use and its environmental footprint, inviting individuals, families, businesses, and communities to participate.
Earth Hour represents a worldwide collective effort to unite people around the idea of taking action for the planet. It invites communities to celebrate a shared pledge to reduce energy demand by turning off the lights for one hour, creating a visible symbol of commitment and solidarity with the natural world.
By unplugging nonessential lighting for that hour, Earth Hour aims to raise awareness about everyday energy consumption and the resulting ecological footprint. The aim is not only to pause electricity use but to spark conversations and inspire lasting changes in daily habits that lessen environmental impact.
DID YOU KNOW?
- Earth Hour originated in Sydney, Australia in 2007, and the idea quickly spread through media and social networks, turning a local action into a global movement, according to the World Wildlife Fund.
- Interest grew rapidly worldwide and by 2008 more than 371 cities across 35 countries joined the initiative, signaling a broad commitment to climate awareness.
- Toronto joined early in 2008, inspired by Sydney’s success, and became one of the first major cities outside Australia to participate, helping to amplify the message across North America and beyond.
- In 2012 the I Will If You Will campaign began, inviting people to pledge ongoing environmental actions if enough others commit to similar changes; notable participants have included Kumi Naidoo of Greenpeace and Miranda Kerr, among others.
- In 2011 iconic British landmarks such as Big Ben and the Houses of Parliament turned off their lights to show support for the cause, demonstrating leadership and global solidarity.
- Across many communities, free concerts, stargazing events, and other family friendly activities happen during Earth Hour, providing joyous ways to celebrate the moment together, and to spark continued curiosity about the planet’s future.
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