This is one of those voluntary black-outs to make a statement about global warming, and of course to save energy for an hour. On the website you can also find tips and tricks how to do Earth Hour "every day" - and lower your energy bills. I got the "invitation" to sign up through a WWF newsletter.
I signed up as an individual - maybe we can do it as a group too and "pledge" to flip the switch on March 29. What do you think?