Earth Hour 2010

Support Earth Hour - In 2009 hundreds of millions of people around the world showed their support by turning off their lights for one hour, Earth Hour. In 2010 Earth Hour will continue to be a global call to action to every individual, every business and every community. ...
At 8.30pm on Saturday 27 March, 2010, the greatest show on Earth for action on climate change will take place in homes, office buildings, town halls and public spaces across the globe as lights go out for Earth Hour 2010.

Earth Hour Canada (Official)
http://wwf.ca/earthhour/