Make 601
Adds C02 emission information to travel sites, extremely clever –

Real Costs is a Firefox plug-in that inserts emissions data into travel related e-commerce website. The first version adds CO2 emissions information to airfare websites such as,,, etc. Following versions will work with car directions, car rental, and shipping websites. Think of it like the nutritional information labeling on the back of food… except for emissions.

The objective of the Real Costs is to increase awareness of the environmental impact of certain day to day choices in the life of the Internet user. By presenting this environmental impact information in the place where decisions are being made, it will hopefully create an impact on the viewer, encourage a sense of individual agency, and provide a set of alternatives and immediate actions. In the process the user/viewer might even be transformed from passive consumer to engaged citizen. Real Costs is project by Michael Mandiberg.

Real Costs – Link.