This is the Carbon Hero, a gadget-software combo that registers your location, velocity and pattern of activity. Then it downloads the data to either your PC or mobile and calculates how much carbon you have used. And then it probably sends it all to Al Gore, Bono and Bob Geldof, so the eco-police could pay you a visit and beat the crap out of you for having a Yeti-sized carbon footprint.

Carbon hero the personal carbon-use calculator [Oh!Gizmo]