Steel is the backbone of the city, from cars to tall buildings, is inseparable from the steel. Steel, on the other hand, also very dirty, about 7% of global carbon dioxide emissions from steel production, the main reason is that 70% of its production process using coal as fuel. According to the world steel association data, although the weak global industrial output in 2013, the global steel makers are still produced 1.6 billion tons of crude steel, rose more than 3% in 2012, compared with 2012, rose just 1.4% in 2011. In infrastructure and real estate in the great leap forward, 

China in 2013 had used up half of the global steel output. Ranking second in the United States use only 6.4%. However, from the Angle of per capita, the situation is very different. According to South Korea's per capita consumption of 1057 kilograms of steel, far higher than all other countries. In contrast, China's per capita consumption is only half of South Korea. South Korea's per capita consumption why so high? In fact, in general, car exporter was often the steel consumption, such as Korea