Thanh Nien: Farmers and fishermen in the Mekong Delta have been hit hard by a poor rainy season – the river has sunk to a record low. Experts worry that these problems are the early symptoms of a coming crisis – one spurred by unsustainable development and climate change. The Asian Development Bank is holding a conference this week to discuss a dwindling fresh water supply on the continent and possible solutions to the potential crisis. Vietnamese scientists estimated that the …