In 2007 TESO was the first shipping company worldwide to use the relatively clean GTL diesel on board. GTL stands for “Gas To Liquids“: Natural gas is converted into liquid diesel oil. The process results in a quite clean fuel, with exhaust fumes containing less harmful substances. The experiment was meant to enhance sustainability in transportation through the use of environmentally and climate friendly fuels and has been a success. Currently TESO is waiting for enhanced availability and a lower cost price for the GTL fuel.