Development of alternative ship propulsion in terms of exhaust emissions Jarosław Markowski, Jacek Pielecha, Remigiusz Jasiński, Tomasz Kniaziewicz and Paweł Wirkowski E3S Web Conf., 10 (2016) 00140 Published online: 23 December 2016 DOI: 10.1051/e3sconf/20161000140