An acrid haze hung over a sprawling dump in Ghana's capital, Accra, as excavators gouged into mounds of smouldering rubbish. Thin plumes of black smoke curled from burning plastic and rubber, mingling with the rank odour of stagnant lagoon water. Agbogbloshie's refuse comes largely from beyond Ghana's borders. Over 60% of Africa’s vehicles are used imports, fuelling a wave of early tyre disposal.