Many people would argue that this has already happened, and that the surge in food prices in 2007 and 2008 was a consequence largely of bio-fuel production in the United States, Brazil and the European Union. Oxfam attributed around 30 per cent of the rise to the diversion of cropland to biofuels. Jean Ziegler, the former UN Special Rappoteur on the Right to Food, concluded that bio-fuel production “is a crime against humanity” and has called for a five-year moratorium on the practice.