Experts predict the internal combustion engine will not lose its dominant position any time soon, but developing engines to meet ever tighter emission limits is costly. So what role are alternative fuels likely to play in the future? Oskar Levander, VP Innovation, Engineering and Technology at Rolls-Royce Marine shares his views. Although nobody can predict how long our oil reserves will last, we can forecast with certainty that demand for it, and with it the price, will continue to stay high. For vessel operators fuel now makes up an increasing proportion of costs.