World Wildlife Fund (WWF) hopes to flip the switch on climate change this Saturday night by urging households, communities and organizations around the world to “go dark” for one hour.

From 8:30-9:30 p.m. local time on March 28, the ninth-annual Earth Hour will inspire global action on six continents and across the world’s 24 time zones. Individuals and groups are encouraged to turn off non-essential lights during this 60-minute period to show their commitment to the planet.

“Climate change is not just the issue of the hour, it's the issue of our generation,” said Sudhanshu Sarronwala, chair, Board of Directors, Earth Hour Global. “Earth Hour is the world’s most enduring people’s movement focused on climate. The lights may go out for one hour, but the actions of millions throughout the year will inspire the solutions required to change climate change.”

Earth Hour has grown from a symbolic lights-off event in Sydney, Australia, to the world’s largest open-sourced environmental campaign mobilizing hundreds of millions of people in more than 7,000 cities and 162 countries and territories. Check out a full-screen gallery of images from 2014 Earth Hour events around the world:

Full-Screen Earth Hour Gallery

Coca-Cola has supported Earth Hour over the years by darkening some of its most iconic signs – from Times Square in New York City, to Piccadilly Circus in London, to Kings Cross in Sydney. The company and its bottling partners also encourage employees to participate at home or through coordinated events, and by turning off the lights in office buildings and facilities.

Visit to learn more about Earth Hour activities happening in and around your city and how you can use your power to change climate change.