BENTIU, South Sudan -- It had not rained properly for months but the floods kept coming, inching up the mud-earth fortifications that stood between Bentiu's marooned and starving people and the endless water beyond. Four straight years of flooding, an unprecedented phenomenon linked to climate change, has swamped two-thirds of South Sudan but nowhere more dramatically than Bentiu, a northern city besieged by water. Hundreds of thousands of people are trapped beneath the water line, protected only by earthen dykes that must be constantly checked and reinforced to avoid a catastrophic breach. All roads out of Bentiu are flooded, including the lifeline to Su...Keep on reading: ‘Uncharted territory’: South Sudan’s four years of flooding