Soaring food prices and starving children provide a stirring backdrop to Europe's debate on its biofuels targets, but the big businesses of farming, forestry and automotive could have a heavier influence on policy. The green credentials of biofuels have come under attack in recent weeks over fears they compete for farming land and push up food prices around the world. Riots over food in more than a dozen countries, from Indonesia to Haiti, have added urgency to the debate.