Shell, Europe’s largest energy company, forecast on Wednesday that global demand for liquefied natural gas, which has been a lifeline for Europe after Russia cut off pipeline gas supplies, will surge by around 50 percent over the next 15 years. The main source of growth is expected to be in China, which will switch from coal to gas in industry to cut emissions, Shell said. The fuel, which is chilled to minus 260 degrees Fahrenheit and transported on specialized ships, has become a significant moneymaker for Shell as part of…