Earth Hour is the single, largest, symbolic mass participation event in the world. Born out of a hope that we could mobilize people to take action on climate change, Earth Hour now inspires a global community of millions of people in 7,001 cities and towns across 152 countries and territories to switch lights off for an hour as a massive show o f concern for the environment.
March 23, 2013 Earth Hour @ 8:30PM
![](https://treeliving.com/wp-content/uploads/2013/03/Earth hour 2013.jpg)