The combustion of conventional fossil fuels accounts for a large share of global CO2 emissions. A great deal of criticism is levelled against cruise and merchant ships for polluting the environment with sooty waste gas and toxic heavy fuels. Researchers at the Fraunhofer Institute for Environmental, Safety and Energy Technology UMSICHT in Oberhausen have been looking into alternative climate-friendly fuels. They are now able to produce a renewable biofuel that can be converted into gasoline, diesel and even kerosene for aircraft. This synthetic fuel reduces greenhouse gas emissions by up to 30 percent compared to fossil fuel. It also produces less soot emissions.