Shell has shipped the long-awaited first cargo of liquefied natural gas from its massive Prelude floating LNG plant off north-west Australia, sealing the nation's position as the world's top exporter of the fuel.

Shell has shipped the long-awaited first cargo of liquefied natural gas from its massive Prelude floating LNG plant off north-west Australia, sealing the nation's position as the world's top exporter of the fuel.