By Sabrina Valle and Arathy Somasekhar HOUSTON (Reuters) -Oil major BP expects to double crude output from its Thunder Horse project in the U.S. Gulf of Mexico and inaugurate its latest production platform by the end of this year, a company executive said on Monday. The company, which is betting on “lower carbon, more economical” offshore oil and gas exploration and production in the U.S. Gulf of Mexico, said a lack of oil investment worldwide could lead to oil scarcity. “More Gulf of Mexico oil and gas helps improve emissions globally,” Starlee Sykes, BP’s Senior Vice President for the Gulf o…