Last week British Airways announced that the world’s first sustainable aviation fuel plant will be built in Thurrock, Essex. The airline claims that 575,000 tonnes of plastic waste, otherwise destined for landfill or incineration, will be converted into 120,000 tonnes of liquid fuel each year. According to BA, that’s enough to power the annual flights from London City Airport, twice over. The concept of converting landfill waste into jet fuel sounds like something out of a science fiction film, but in fact, relies on two long-standing techniques.