Linda Cook, a former executive director at Royal Dutch Shell, who, among other things, managed a large chunk of  the company’s green investments, has joined Marathon Oil’s board of director. Prior to exiting Shell in 2009, Cook  scaled back the company’s green power …

Royal Dutch Shell is the latest oil major that is backing away from green energy investments to focus on its traditional oil and gas business. In announcing a $32 billion capital spending program earlier this week — most of it going to prop …