The Canadian government has approved a $5.5 billion oil pipeline project after a federal court sent it back for review last year.

Environmentalists and First Nations groups successfully challenged the Trans Mountain project last year, with a federal court ruling the government had failed to adequately consult First Nations community over the project’s impact on endangered killer whales.

Canadian Prime Minister Justin Trudeau says the project will fund Canada’s “transition to a green economy”, and ease its reliance on US oil markets.