Earth Hour: Will it matter?

Where's my jetpack? has a nice post on the blackening of Google for today's Earth Hour. I think they raise an important question: will it really get us to change? Believe me, I'm all in support of doing whatever it takes to help prevent any further global warming but I also agree that it's going to take a lot more than a few idealists to get things done. We need the vast majority of people to get on board and unfortunately it looks like most people don't give a shit about our planet or the people they share it with. What do you think?