Independent: Descendants of John D Rockefeller, America’s first and biggest oil industry magnate, say that ExxonMobil, a company spawned from his 19th-century monopoly Standard Oil, faces becoming obsolete if it does not step up the search for alternative fuels. Fifteen family members yesterday went public in an attempt to get Exxon to face up to the realities of climate change, and they promised to join a shareholder rebellion to shake up the board to alter company’s strategy. "Kerosene …