OSLO, May 13 ― Norway's US$1 trillion (RM4.33 trillion) sovereign fund said today it had excluded four Canadian oil and gas companies from its portfolio for producing excessive greenhouse gas emissions, its first use of that reason to blacklist firms.

Canadian Natural Resources Ltd, Cenovus Energy Inc, Suncor Energy Inc, and Imperial Oil Ltd were excluded due to "unacceptable greenhouse gas emissions”, Norges Bank Investment Management (NBIM) said.

The firms did not respond to requests for comment after market hours.

"The Council on Ethics recommended to exclude the companies because of carbon emissions from production of oil to oil sands,” NBIM said, referring to its ethics watchdog.

Excessive carbon emissions became a criterion for exclusion from the fund four years ago, joining the production of nuclear arms, landmines and tobacco, human rights violations and other grounds for removal.

The ethics council had examined companies in the oil, cement and steel sectors before recommending its first exclusions based on excessive greenhouse gas pollution, the fund said.

NBIM said it had also excluded three other companies ― Egypt's ElSewedy Electric Co, Brazilian iron ore miner Vale SA and Brazilian power holding Eletrobras - for causing environmental damage.

Vale declined to comment. Eletrobras and ElSewedy could not immediately be reached.

NBIM, which is a unit of the central bank, said it had taken a long time to sell shares of several of the blacklisted companies in a reasonable manner due to the "market situation, including liquidity in individual shares”.

It always sells its holdings before any exclusions are announced, to avoid excessive market movements.

The fund today also reversed its earlier exclusions of two firms ― New York-listed AECOM and Hong Kong-listed Texwinca Holdings Ltd, both of which are now eligible for its portfolio.

AECOM had been excluded for involvement in the production of nuclear arms, a business it has now discontinued, the fund said, while Texwinca had been sidelined over perceived breaches of workers' rights by a subsidiary that has since been liquidated.

The fund, set up in 1996 to save petroleum revenues for future generations, is among the world's largest investors, owning around 1.5 per cent of all globally listed shares. Its exclusions are often followed by other funds.

It already excludes most coal miners under a separate exclusion criteria based on their product. The emissions rule is meant to separate out firms seen as the biggest polluters in an industry while holding on to the rest. ― Reuters