It is hard to decide which looks more forlorn, Webster Malupande or the wilted maize stalks around him. A smallholder in southern Zambia, Mr Malupande is one of many farmers devastated by a recent drought that halved production, leading the government to declare a state of emergency. Even before then he struggled to get more yield from his fields. “We do what we can,” he says, “but it is never enough.”