Exxon Mobil Corp. hopes an outsider who most recently headed General Motors Co.’s driverless-car unit can shake up its efforts to build a climate-friendly business unit.
The oil giant recently tapped Dan Ammann , a former investment banker and longtime GM executive, to lead its fledgling low-carbon business.
Mr. Ammann’s task is daunting: turn a new unit intended to reduce carbon emissions into a profit center.