The Greens will on Thursday launch a campaign to get the $85 billion Future Fund to sell its holdings in fossil-fuel industries, starting with coal.

The fund's energy holdings now total about $3 billion, and are exposed to a ''carbon bubble'' as nations shift towards low-carbon fuels, Greens leader Christine Milne said.

The International Energy Agency last year estimated that two-thirds of proven fossil-fuel reserves would have to remain in the ground if the world is to avoid global warming of 2 degrees above pre-industrial levels.

''It's good for the planet, good for people and good for long-term financial management to get out of coal,'' Senator Milne said.

The Greens are hoping to match the success of the anti-tobacco push, which led to the Future Fund deciding in February to dump its $222 million holdings of tobacco-related investments.