60

http://www.flickr.com/photos/earthhour_global/3386185889/
1 hour, without light on, makes us feel the importance of electricity.
60 minutes, without electricity, amaze us how our ancestors have had their nights, at places where unpleasant weather lands.

Clean up the mess that we produce,

Global Warming.
Reduce our carbon emission footprint, to save a little more for our earth, and our coming kids.

p/s: Quit smoking too, people.