Reuters: A wall of heat and sulfur from a towering furnace stoked to 1,500 degrees Celsius hits onlookers at POSCO’s Pohang plant in South Korea amid the din of coal and iron ore rattling into vats of molten metal. Pohang’s oldest furnace, with a 35-year history, helped POSCO grow into the world’s No.4 steel giant. But it could soon become a thing of the past as POSCO, which alone produces around 10 percent of South Korea’s total carbon dioxide emissions, moves to new technology to cope …