Life-saving food aid in Chad for hundreds of thousands of refugees from war-torn Sudan will grind to a halt in April without international funding, a United Nations agency warned Tuesday. The UN World Food Programme (WFP) is appealing for $242 million in donations to continue supporting 1.2 million Sudanese refugees, as the approaching rainy season threatens to cut off road access for humanitarian deliveries in eastern Chad. “We are in a race against time,” WFP’s Chad director Pierre Honnorat said in a statement. “We’ve already cut our operations in ways that would have been unthinkable just a…