Soon tracking your carbon footprint will require nothing more than a software installation on your cell phone. Developed at start-up company Carbon Hero in London, the software Carbon Diem takes advantage of global positioning satellites (GPS) to figure out automatically what transportation you are using, and, based on that deduction, calculate your up-to-the-minute carbon impact.  The company's chief executive Andreas Zachariah, who is also a student at London's Royal College of Art, came up with the idea after he got tired of calculating his own carbon usage manually through various online calculators.

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