Abstract: Facing the dual challenge of increased energy demand and emission reduction, the transition in transport and mobility is inevitable. This paper reviews and evaluates multiple advanced powertrain systems and alternative fuel options, in combination with future powertrain developing trend. These include conventional liquid fossil fuels (i.e. gasoline and diesel) and enabling advanced internal combustion engine technologies, clean alternative fuels [e.g. biofuels, gas-to-liquid (GTL) fuels, power-to-liquid (PTL) fuels, liquified nature gas (LNG) etc], and electrified powertrains (incl. hybrid, battery electric and fuel cells). Fuel options in liquid state is focused. Shell believes there’s no single option able to tackle the complex energy challenge, and thus a mosaic of new fuels and powertrains, applied in different applications respectively, will be needed. We will also introduce 3 Shell scenarios published recently based on analysis of different political, economic and social trajectories, namely Shell Mountain, Ocean and Sky Scenarios, followed by Shell’s view on transition and decarbonization in transport sector.

Key words: clean alternative fuels , internal combustion engine , biofuels, gas-to-liquid , (GTL) fuels ,  power to liquid (PTL) fuels ,  liquified natural gas （LNG) , electrified powertrain , scenario