The shipping industry emits large quantaties of CO2, NOx and SOx. The regulations regarding these harmful emissions become stricter. For ship owners there are different solutions to reduce emissions. Among others they can switch to cleaner fuels or install exhaust gas treatment systems. This report provides an insight in the calculation of the effect of these adjustment on financial and environmental aspects. This insight is based on a DFF 3007, a 30m long aluminium catamaran. There are three goals that are answered. First goal is to determine if it is possible to show the environmental and financial impact of different fuels in combination with exhaust gas treatment systems. The second goal is to investigate the effect of changing fuel prices on the financial result and the last goal is to determine the effect of exhaust gas treatment systems in terms of environmental and financial results.