Earth Hour | 6,712 followers on LinkedIn. Join us again for Earth Hour on Saturday, 28 March 2026, 8:30pm local time as we create the #BiggestHourForEarth | Earth Hour, organized by WWF, is a global grassroots movement uniting people to take action for the planet. Earth Hour famously started in 2007 as a lights out event in Sydney, Australia to raise awareness of the climate crisis. More than a decade-and-a-half later, Earth Hour has grown to engage millions of supporters in more than 190 countries and territories, inspiring individuals and organizations worldwide to celebrate our one shared home while continuing to shine the spotlight on climate change and nature loss.