Do you already know about Earth Hour? Okay, if you don't, here's how it's described on the "about" section of the organization's website:
What began as a campaign to get Sydneysiders to turn their lights off, has grown to become one of the world's biggest climate change initiatives. In 2009, at 8.30pm on March 28, people around the world will turn their lights off for one hour – Earth Hour. We're aiming to reach one billion people, more than 1000 cities, all joining together in a global effort to show that its possible to take action on global warming.
So, it's funny (or scary) that there are very few US cities signed up for this. I mean, it's a Saturday night, so I'm surprised this isn't more of a movement. I'm starting to check out all that's involved, but if you're interested, see how you can make Earth Hour happen in your town.
And there are more way to take action here.