The era of cheap food for Asia is over as surging demand, supply problems and the growing production of biofuels will keep food prices high, the Asian Development Bank (ADB) warned Tuesday. In its latest Asia Economic Monitor report, the Manila-based lender warned that while previous food price surges were "cyclical and temporary,' the higher prices now being seen were caused by permanent changes. "This time, the impetus appears to come from persistently rising demand ...