Business Green: SK Energy, South Korea’s largest oil refiner by output, is teaming with domestic steel maker Pohang Iron and Steel Co (Posco) to develop “clean coal” technologies at a total cost of 3.35 trillion won (US$2.6bn, £1.6bn). The two companies have signed a deal to jointly develop a manufacturing process for synthetic natural gas, according to an announcement at the weekend by the Ministry of Knowledge Economy. The ministry, which regulates economic policy in the industrial and energy …