Defense and aerospace giant Lockheed Martin will build tanks for liquefied natural gas to power ocean-going vessels at an idled NASA facility that previously made fuel tanks for the Space Shuttle, the company announced Tuesday. The maritime industry is beginning to design vessels that can be powered by natural gas to save fuel costs and air-fouling emissions. Low-grade bunker oil burned today emits large amounts of particulate matter, sulfur and nitrogen oxide. Natural gas pro...