Guardian: The UN secretary-general, Ban Ki-moon, has called for a comprehensive review of the policy on biofuels as a crisis in global food prices – partly caused by the increasing use of crops for energy generation – threatens to trigger global instability. "We need to be concerned about the possibility of taking land or replacing arable land because of these biofuels," Ban told the Guardian in Bucharest while attending this week’s Nato summit. But he added: "While I am very …