I am sure that this is not the last footprint calculator we will feature here. This one is backed by WWF and supported by The Independent. It is really very easy to use – you just answer around 10 simple questions about travel, food, consumption, etc and then it tells you how many planets would be needed to support your lifestyle. It also tells you if you are under or over the UK average.

The killer is air travel. Everything else I do takes me well under the UK average, but the fact that I fly a fair bit to the US for work and a fair bit to Europe for leisure negates all the good things I do and means that I am really not helping the planet. I have cut down US trips by making them longer and taking in many more meetings in one trip, but it is difficult to cut them out completely when the company has at least 40% of its business in the US!