High rise buildings are seen in a high density urban area of Hong Kong on April 23, 2015. Climate change, which causes rising sea levels and is linked to natural disasters, is a fundamental threat to development, theWorld Bank chief Jim Yong Kim said on April 23, 2015, adding the focus on mega cities was 'vital' since the mode of urban development could determine how the world combats climate change as disasters could bring massive impact on populated cities. AFP PHOTO / Philippe Lopez        (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)