Shipping services in Guinea are being upended as the West African country ramps up iron ore exports for China’s “green steel” production lines to take advantage of much higher prices. Vessels that usually ship bauxite from Guinea have been diverted to iron ore to maximise exports before heavy seasonal rains grind production to a halt, according to international shipbroking and maritime research firm Ifchor Galbraiths. Analysts say that shoring up supplies from Guinea helps China with its broader...