The Danish island of Samsö has been carbon-neutral for years, generating more renewable energy than its residents need. The farmers here have invested in wind turbines. They burn locally-grown straw in central plants to provide heat. Despite that, the island isn't a 100-percent ecological. The cars and tractors here are still powered by diesel and fuel. That's now set to change. The brains behind a novel project, Sören Hermansen, is planning to make Samsö truly carbon-free. He's pushing for all vehicles to be propelled by electric engines.