Did you know that the CO2 emissions from just 15 computers is equal to that of one car? No, neither did I. You probably also wouldn't have known, then, that there's about 660 million computer users worldwide, and between them they consume millions of kilowatts of energy every day - and it's estimated that the combined annual energy wastage from all the people that forget to switch their computer off at the end of the day totals in the region of 30 billion kilowatts of energy.

Enter, LocalCooling.com, who have created a totally free and totally... er... cool little software program (XP only) for optimising your computer's power usage, and giving feedback on energy saved. Read more computer energy facts here, and download the software here.

You can also create an account, so that when logged in your energy savings are reflected in the total savings of all the users of this application - with the goal of encouraging hundreds and thousands of users to decrease their PC energy consumption.

Besides the direct energy saving results, a utility like this keeps the conservation concept always in front of you - potentially reminding you to save in other areas as well.