The rise of the IT age means hazardous materials from electronic devices are being released into the environment at an increasing rate.
Correlation between exposure to lead and violence is being taken seriously across scientific world.
The phasing out of leaded petrol seven years ago may cause a significant decline in crime in South Africa in another 11 years.
Health workers have set up emergency treatment centres in northern Nigeria for scores of children suffering from lead poisoning.
More than 160 villagers from Nigeria's north died from lead poisoning while trying to leach gold from rock deposits.