Earth Hour

Ok, so when I first saw this I thought, this is the same thing as those "boycott the gas stations for a day" things, which really don't accomplish much because you eventually need to buy that gas. You're just doing it on Thursday instead of Wednesday.

But this idea--of turning off the lights for one hour--actually does save electricity. You can't go back to that hour later or use twice as much electricity to power your lights the next day.