Filipino farmers like Romeo Wagayan have been left with little choice but to let their vegetables rot in the field rather than sell them at a loss, as rising oil prices linked to the conflict in the Middle East drive up the cost of harvesting, labour and transport.“There’s nothing we can do,” said Wagayan, a 57-year-old vegetable farmer in the northern Philippine province of Benguet.“If we harvest it, our losses only increase because of labour, transportation and packing costs. We don’t...