File photo taken on Nov. 24, 2014 shows an outdated boiler demolished in Tangshan City, north China's Hebei Province. China's carbon emissions saw the largest drop in years as the nation furthers structural readjustment to improve growth quality. In the first half of 2014, China's carbon intensity was cut by about 5 percent, the largest drop in many years. Carbon dioxide emissions per unit of gross domestic product have dropped 28.56 percent by 2013 from the level of 2005, or a reduction of 2.5 billion tonnes of carbon dioxide emissions, according to the National Development and Reform Commission, the country's key economic planning body. The Chinese government has pledged a 40 percent to 45 percent reduction of carbon dioxide intensity by 2020 from the levels in 2005 and is committed to making every effort to achieve the target. (Xinhua/Yang Shiyao)