"We have much more serious problems": this is the answer most often heard by Dejan Furtula, who has been fighting for years against the pollution of the Drina, Bosnia's longest river. The problem is at its worst during the high-water season, when the river picks up waste left in the illegal dumps on its banks. "Unfortunately, people don't understand that it's a question of health", says Furtula. IMAGES AND SOUNDBITES