Earth Hour

What are you doing from 8:30 - 9:30pm on Saturday, March 28th? You should be turning off all your lights (and unplugging all those appliances that don't need to be plugged in all the time - the toaster, microwave, lamps that are hardly used, video consoles, etc) in recognition of Earth Hour

read more here

Obviously turning off your lights for one hour isn't going to make a big difference - but it is making a statement. You can take one hour to do something good for the earth, say you are ready for USA to sign on with the Kyoto Protocol (spare me the sob stories about how China and India are getting special treatment and we aren't. boo hoo). This year 2,500 cities and towns in 82 countries have joined up. Even if your town hasn't signed up (and quite honestly, if you live in the US, it probably hasn't) you can do it yourself. Its just one hour of darkness. Light a candle and play cards in the candlelight. Play flashlight tag with the kids. If it isn't pitch dark at 8:30 where you live, go out for a walk at dusk. There are plenty of things you can do without the lights on.

Small history of Earth Hour - it started in 2007 in Syndey, and last year it spread around the world. Some of the bigger world landmarks that went dark were: the Golden Gate Bridge in San Francisco, Rome’s Colosseum, the Sydney Opera House and the Coca Cola billboard in Times Square. This year the Great Pyramids of Giza will be dark, as well as some additional Coca Cola famous billboards.

So read more about Earth Hour, turn off your lights, unplug those appliances (and don't plug them back in when Earth Hour is over. I managed to reduce my electicity usage by 35% in a month by unplugging things - that saves money!) and do something good for the world.
Honestly, to me it isn't enough. These places should be dark a lot more than just one hour a year. But it's a start.