The popular "Ask the EcoGeek" column takes a look at operating computers efficiently. There are tons of opportunities to reduce your PC's carbon footprint and save money in the process, not only while it's running, but also after it apparently ceases to.

In his reply, Hank Green mentions a little utility that's been getting a lot of attention lately.

So always either shut down or suspend the operation of your computer when it's going to be idle for a long time. This is the most important step we can take to decrease computer use. Of course, sometimes it's hard to remember. Which is why I like to use Snap's CO2Saver application. It keeps an eye on the way I use my computer, and idles my machine when I'm not using it. It also lets you know how much CO2 you've saved by using the application's new settings. Unfortunately it only works with XP and Vista.

Pay EcoGeek a visit for the rest of the tips.