With an expressed goal of preventing more than a billion pounds of greenhouse gas emissions from entering the Earth's atmosphere, Environmental Defense last week launched a campaign encouraging Americans to replace one million standard light bulbs with energy efficient models. According to the organization's news release, in just the first few hours of the online campaign Americans pledged to replace bulbs that will save 35 million pounds of carbon dioxide pollution. The website tells you why the action is important and says if you tried the bulbs a few years ago and were disappointed, it's time to try them again. There is a section on how to buy a better bulb. Check it out.