Changers is a free tracking app that rewards users for choosing sustainable transport options. When users take a journey on foot, or by public transport, the app compares the carbon imprint of the journey to that of the same journey made by car. Any emission savings are converted into Recoin units, which can be used to purchase CO2 certificates to make car or plane rides carbon neutral. Users are encouraged to compare their scores with others using a worldwide leader-board.
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