The world's richest nations are dumping hazardous electronic waste on poor African countries, says the head of the UN's Environment Programme (Unep).
Speaking in Nairobi, Achim Steiner said consumerism was driving a "growing mountain of e-waste".
Unep estimates that up to 50 million tonnes of waste from discarded electronic goods is generated annually.
Improper disposal of e-waste can release hazardous chemicals and heavy metals into the environment.
Mr Steiner made his comments at the opening of a week-long conference in Nairobi which will review the Basel Convention, aimed at reducing the movement of all types of hazardous waste.