An employee washes the floor next to foundry crucibles at a POSCO factory in Pohang, about 370 km (230 miles) south of Seoul, in this July 20, 2006 file photo. Pohang's oldest furnace, with a 35-year history, helped POSCO grow into the world's No.4 steel giant. But it may soon become a thing of the past as POSCO, which alone produces around 10 percent of South Korea's total carbon dioxide, moves to new technology to cope with stricter carbon emission rules. To match feature ENVIRONMENT-SUMMIT/KOREA-CARBON REUTERS/Kim Kyung-Hoon/Files (SOUTH KOREA)