London Guardian 
Tuesday, Sept 30, 2008
Keeping track of your carbon footprint could become as simple as slipping a mobile phone in your pocket: a London-based start-up company has developed software for mobile phones that uses global positioning satellites to work out automatically whether you are walking, driving or flying and then calculate your impact on the environment.
Carbon Diem’s inventors claim that, by using GPS to measure the speed and pattern of movement, their algorithm can identify the mode of transport being used. It can therefore calculate the amount of carbon dioxide that a journey has emitted into the atmosphere – without any need for input from the traveller.
The system’s inventor, Andreas Zachariah, a graduate student of the Royal College of Art in London and chief executive of the Carbon Hero company, said that Carbon Diem is the world’s first automated carbon calculator.
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Because it keeps a constantly updated diary of a person’s carbon emissions, Zachariah said that a user can easily track their environmental impact and, if they choose, modify their behaviour to lower-carbon alternatives.
“We’re facilitating people to make little changes and allow those changes to be noted and registered and possibly shared,” he said. “If lots of people realise we’re in this marathon [in tackling climate change] and we’re not running alone, then we actually think people will be motivated to stick to changes.”
He has tested the software in Nokia and Blackberry phones, using computer algorithms to predict the kind of transport a person is taking. He claims that in tests over the past year, the software was almost 100% accurate in working out when people were on airplanes or trains; it was between 65-75% accurate at guessing when people travelled on buses.