Ben van Beurden, chief executive officer of Royal Dutch Shell Plc, speaks during the World Gas Conference, in Paris, France, on Tuesday, June 2, 2015. Oil companies that have pumped trillions of barrels of crude from the ground are now saying the future is in their other main product: natural gas, a fuel theyre promoting as the logical successor to coal. Photographer: Christophe Morin/Bloomberg via Getty Images
