alternative to Diesel Strengthens as Barriers Continue to Fall.
From the earliest days of mechanically propelled ships, fuel use has been evolving. Starting with wood, fuel changed to coal, which held sway for many years. Oil began to be used in the late nineteenth century and was clearly the dominate marine fuel of the twentieth century. Environmental shortcomings of fuel oil, particularly traditional heavy bunkers, were brought under increasing scrutiny as the twentieth century came to a close. As air emission regulations became more strict and petroleum costs increased, ship owners and operators began searching for an alternative fuel. Consideration may be given to non-fossil-fuels, but all have practical drawbacks. Among the available fossil fuels, natural gas is the cleanest – and the price has been dropping in recent years.