Earth Hour 2009 is scheduled for this Saturday, March 28. It's a one-hour blackout, from 8.30 PM to 9.30 PM local time.
Last year we plunged ourselves into darkness for an hour and wondered why, since it's so easy to do and it saves so much energy, we didn't observe Earth Hour once a week. Life is all about habits, though, and turning off every light in your house for an hour a week (daytime doesn't count) isn't one of them - it takes some remembering.
Anyway, I'll be shutting everything off, computers and all, on Saturday for an hour. You should too.....and you can sign up on the Canadian site and be entered to win a trip to see the Churchill polar bears.