Maputo (AFP) - The leader of Mozambique's second largest opposition party and a top mayor who fought climate change in his low-lying coastal city Beira, Daviz Simango, has died aged 57, his family said Monday. He was transferred to a South African hospital last week for treatment, his brother Lutero Simango said in a text message, without disclosing the nature of the illness. As mayor of Beira, a key port that lies below sea level, Simango worked to shore up the city's climate defences against rising seas, flooding and storms.