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In particular, they said, countries in the emerging world are now placing so many export controls on items such as wheat in order to conserve them for their own populations that they have sometimes refused to release supplies when the WFP has asked for emergency goods."We have never seen this before: we went begging for wheat and for two weeks we could not find it," said a senior WFP official at the World Economic Forum in Davos, where growing geopolitical tensions over food supplies and other resources dominated many of the debates.