Poverty remains the biggest hurdle to reaching sustainable development in South Asia, a U.N. Environment Program official said Saturday in Colombo, Sri Lanka, at the launch of four national "State of the Environment" reports...The reports identify five priority environmental issues in each country: for Bangladesh, land degradation, water pollution and scarcity, air pollution, biodiversity loss and the threat of natural disasters; for Bhutan, environmental effects of rural-urban migration, land degradation, air pollution, pressure on and pollution of water resources and solid waste management; for India, land degradation, biodiversity loss, air pollution (particularly from urban vehicle use), freshwater resource management and hazardous waste management; and for Sri Lanka, land degradation by soil erosion, waste disposal, pollution of inland waters, biodiversity loss and depletion of coastal resources