River Have Problems News Today

River. keir simmons explains. >> reporter: the mighty mekong river, source of food and water for millions and tonight the front line in a david and goliath confrontation with china. >> when the river have problems, then people will have problems too. >> reporter: you dont have the food because you dont have the fish. >> we have nothing. >> reporter: in ten years, the mekong has changed dramatically an estimated 40% of fish have disappeared on this stretch of river, according to the mekong river ...