calmTonight's the night that we switch off the lights between 8:30 pm and 9:30 pm.
Earth Hour is designed to raise awareness of climate change, and was initiated by the World Wildlife Fund in Sydney, Australia in 2007. It is observed by at least 4,000 cities in 88 countries of the world (including the city of Ottawa).
So, remember, turn off the lights for an hour tonight and honour Earth Hour.