Nigeria’s northeast is facing a tightening hunger gap, say aid organisations, pointing to two years of missed crop harvests in what was once a breadbasket for the country, and the high likelihood of missing a third. [...] The UN says it needs $1.5 billion (€1.4 billion) in humanitarian aid this year for the Lake Chad region – which spreads across parts of Nigeria, Niger, Cameroon and Chad – and $457 million had been pledged for 2017 by late February.