many people would argue that this has already happened and that the surge in food prices in and was a consequence largely of biofuel production in the united states brazil and the european union oxfam attributed around 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 biofuel production is a crime against humanity and has called for a fiveyear moratorium on the practice