Leonardo DiCaprio is joining a campaign to use investment decisions to fight global warming by shedding his own fossil fuel investments.

The actor joined members of the Divest-Invest Coalition in New York on Tuesday as it made the announcement on his behalf. A leader of the effort, Ellen Dorsey, said DiCaprio planned to divest his own and his foundation's fossil fuel holdings.

The coalition says organizations, companies, state and local governments and individuals worth $2.6 trillion have pledged to reduce or eliminate their fossil fuel investments. That's 50 times the size of commitments it counted last year.

Organizers estimate 3 to 8 percent of the institutions' holdings are in fossil fuels.

The Independent Petroleum Association of America maintains divestment harms the institutions while making little difference on targeted companies.