Beijing, ChinaA string of serious poisoning incidents caused by industrial pollution have triggered strong public protests across China, but experts say the events could represent an opportunity to improve the nation's environmental protection.A serious case of pollution in Fengxiang County in northwestern Shaanxi Province in early August led to 174 children from three villages being diagnosed with lead poisoning, with 851 of 1,016 children tested found to have abnormally high levels of lead in their blood.The poisoning, very likely caused by pollution from a nearby smelter, has led to violence among outraged parents, who reportedly smashed trucks and tore down fences...