New York Times: 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 on Monday that its $860 million philanthropic organization, the Rockefeller Brothers Fund, is joining the divestment movement that began a couple years ago on college campuses. The announcement, timed to precede Tuesday’s opening of the United Nations climate change summit meeting in New York City, is part of a broader and…