Nigeria, Morocco, and their partners expect to make a final investment decision next year on what would be the world’s longest offshore gas pipeline from Nigeria to Morocco and onto southern Europe, the chief executive of the Nigerian state oil firm told Bloomberg in an interview. The pipeline, expected to cost between $20 billion and $25 billion, is planned to run for 3,840 miles (5,600 kilometers) from Nigeria along the West African coast to Morocco before connecting with pipelines in Italy and Spain and potentially delivering more non-Russian…