We’d be really interested to know what you think about this carbon footprint calculator. In addition to giving the user a one-off figure which can feel very daunting, the system prompts you to answer some questions about day-to-day activities, then updates your score. That in turn prompts further questions, each time refining the score, sometimes lowering it. The process can become quite competitive!

Your step by step guide to a lighter footprint on the planet