The number of electric vehicles on the world’s roads is rising fast. Latest figures show there are more than three million and sales are growing at close to 75% a year. But now doubts have been raised about the ethics of buying one.

Amnesty International says human rights abuses, including the use of child labour, in the extraction of minerals, like cobalt, used to make the batteries that power electric vehicles is undermining ethical claims about the cars.

Kumi Naidoo, Amnesty’s Secretary General, told the recent Nordic EV Summit in Oslo, that climate change should not be tackled at the expense of human rights. “Without radical changes, the batteries which power green vehicles will continue to be tainted by human rights abuses,” he said.