I didn't hear about earth hour until my boyfriend turned off the tv and lights right in the middle of the basketball game, and i was really mad at him. but when he explained what he was doing and about it i thought the idea is really cool. I saw pictures online of all the cities with the lights off and it was gorgeous. I dont know if a lot of people participated it in their own homes, there were no other houses around with lights off or anything like that, but if you think about big cities like chicago shutting the lights off thats still a decent amount of energy saved.