Steven Donziger, the US indigenous rights campaigner and disbarred environmental lawyer who won a case against the energy firm Chevron over pollution in the Ecuadorian rainforest, was sentenced to six months’ imprisonment for criminal contempt charges arising from a lawsuit brought by the oil giant. The sentence came a day after he asked the court to consider an opinion by independent United Nations experts that found his court-ordered home confinement of more than two years was a violation of international human rights law.