The World Trade Organization called on Friday for countries to work together more closely in trade in natural resources — an area often seen as exempt from many international commerce rules. Governments must cooperate more intensively to deal with the challenges for both importing and exporting countries in trade in natural resources, such as export restrictions and import tariffs, it said in its annual World Trade Report.
See http://www.reuters.com/article/idUSTRE66M1KS20100723.