Old clothes could be given new life as jet fuel thanks to a new collaboration between Japan Airlines, recycling firm Japan Environmental Planning (Jeplan), and the Green Earth Institute. Jeplan developed a method to turn discarded garments, collected from retailers like Aeon and Muji, into biofuel using a kind of fermentation technology and is in the process of building an experimental fuel plant at one of its factory locations. Although cotton yields only a small amount of fuel, the resourcefulness of the technology and benefits of diverting unwanted clothes from landfills is promising.