SAP has built a Carbon Exploration prototype on top of the AMEE APIs that allows you to calculate the environmental footprint of an individual or family and then run what-if scenarios to see how various lifestyle changes would affect your emissions profile.
The software-as-a-service prototype includes a simple drag-and-drop interface that allows you to specify your appliances, electronics, transportation, and other sources of energy consumption. In addition to presenting a running tally of your monthly emissions, the application allows you to measure the impact of making simple adjustments, such as replacing incandescent light bulbs with CFLs, or powering down appliances that are usually in standby mode.
The prototype also includes a variety of dashboards that allow you to compare emissions profile with the people in your area or — most intriguingly — with your friends. For the latter, you first need to install the prototype as a Facebook application. For road warriors, the prototype also offers integration with Tripit.