A cyclist wears a protective face mask while passing dozens of factories processing rare earths, iron and coal on the outskirts of Baotou city in Inner Mongolia, northwest China in 2011. The World ... more 

A cyclist wears a protective face mask while passing dozens of factories processing rare earths, iron and coal on the outskirts of Baotou city in Inner Mongolia, northwest China in 2011. The World Trade Organization (WTO) is to investigate China's export restrictions on rare earths less