The Human System.
Tropical nations have made significant progress but face a variety of challenges that demand focused attention across a range of development indicators and data in order to achieve sustainable development. By 2050, the region will host most of the world's people and two-thirds of its children. Consistent with the higher levels of poverty , more people experience undernourishment in the Tropics than in the rest of the world. The proportion of the urban population living in slum conditions is higher in the Tropics than in the rest of the World.