Let us introduce you to The Green Way Up project: four Australian guys proposing what could possibly be the longest road trip ever. In the next few months they intend to hop in their car in Hobart, and they won’t stop until they get to Norway. The catch is that, for the entire 40,000 kilometres, on a route which will pass through 30 different countries, they won’t stop for petrol once. Instead, they’ll use waste oil, grease, animal and even human fat to power their car. The trip isn’t an exercise in guilt; it’s an attempt to make being green fun. Oscar Peppitt, one of the four adventurers, says: "We’re not here to judge, we’re not here to alienate or ostracise, in fact – we’re not even here to set a good example. We want to create conversations." Part of this plan is for other people to have a hand in their adventures. One example, which they’ve proposed themselves, is a challenge which will see each of them attempt to learn a different language over the course of the trip. By the end of the trip, the person who’s done the worst job gets set up on a date with a sharp knife and will have the fat from their backsides processed into biodiesel to power their car. For now, you can follow their planning and offer them some advice at their freshly launched website.