NEW YORK - John D. Rockefeller built a vast fortune on oil. Now, his heirs are abandoning fossil fuels. The family whose legendary wealth flowed from Standard Oil is planning to announce today that its $860 million philanthropic organization, the Rockefeller Brothers Fund, is joining the divestment movement that began a couple of years ago on college campuses.

NEW YORK �John D. Rockefeller built a vast fortune on oil. Now, his heirs are abandoning fossil fuels.

The family whose legendary wealth flowed from Standard Oil is planning to announce today that its $860 million philanthropic organization, the Rockefeller Brothers Fund, is joining the divestment movement that began a couple of years ago on college campuses.

The announcement is timed to precede Tuesday�s opening of the U.N. climate-change summit meeting in New York.

In recent years, 180 institutions � including philanthropies, religious organizations, pension funds and local governments � as well as hundreds of wealthy individual investors, have pledged to sell assets tied to fossil-fuel companies from their portfolios and to invest in cleaner alternatives.