Swedish surfer Daniel Heilborn's old Volvo

Swedish surfer Daniel Heilborn has had this old Volvo as his only car for the last fifteen years. But not only does Heilborn look like a baller when he's searching for waves on the Swedish island of Gotland, he runs his car on biogas made up of food waste and sludge. "They rot it to create the fuel," says Heilborn, "so you drive on pure waste." He estimates that he's travelled roughly 50,000 miles around the coast of Gotland, and for the last 3,000 of those he's been using biogas. "It just feels so much better than driving around on fossil fuels... The carbon emissions get reduced by almost 95%."

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Gotland is Sweden's largest island and has plenty of coastline to explore, but due to its location in the Baltic Sea there's only a small area of fetch from which to receive swell. No doubt it plays host to some quality surf from time to time though, as indeed does the mainland, as we saw in this short clip from a month or two ago.

All the biogas used by Daniel's Volvo is produced locally on the island. Biogas is formed by the anaerobic digestion of raw materials - we're not quite sure what that means, but have a read about it on Wikipedia. Or if you're above Wikipedia, how aboutGuardian article by George Monbiot detailing some of the benefits and potential problems entailed by biogas.