Tanking up on petrol

Nicola, Pete, Lola and Nell want to travel the world with a difference. We hope to get a taste of many countries without adding to climate change (with needless emissions from aeroplanes) or having to waste hours of holiday time in airport terminals. We hope our adventures inspire you to take a Grand Tour of your neighbourhood. This post is from Nicola

We are over a third of a way into our tour of Britain and have so far bought just three tanks of petrol. I think we may buy three more. (I am not counting the fuel used by the trains or buses we are taking)

So how much will six tanks of lead-free petrol add to our year's or lifetime's carbon footprint? That's a question I need to think about - it's definitely more than we normally use in a year, but it is significantly less than the average family's use.

And here's another one for us to wonder about: what is the right way to offset these extra carbon emissions?