The U.N. has identified Kabwe, a city of almost 300,000 people in Zambia, as one of the most polluted places on the planet. Who is to blame? And... In a soft, faltering voice, her large brown eyes ...

"We want to see one day a city free from lead," he adds. A waste heap known as Black Mountain stands at the site of the former Broken Hill lead and zinc mine, in the town of Kabwe, Zambia ...