There are tons of CO2 and GreenIT calculators on the web – Here are some examples:
Business
- http://www.forrester.com/GreenIT
- http://www.vmware.com/solutions/green/calculator.html
- http://www.webex.de/go-green/calc.php
- http://www.business.gov/manage/green-business/energy-efficiency/calculate-savings/energy-saving-calculator.html
- http://www.microsoft.com/environment/greenit/
Personal
- http://www.energystar.gov/index.cfm?fuseaction=popuptool.atHome
- http://www.digitaltips.org/green/energy-calculator.asp
If  you have a look on these and try some calculations, you will come to the point that saving miles of traveling is the most efficient way IT can minimize your companies CO2 footprint.
