Green Hydrogen and Green Investments in the New Era, in Accordance with Directive (EU) 2016/802 of the European Parliament and of the Council of the European Union

The continuous and uncontrolled emission of gaseous gases worldwide and across borders between the Member States of the European Union, has led to serious environmental issues, which are related to the depletion of ozone (O3) in the atmosphere, the occurrence and enhancement of the greenhouse effect (GHG), the global warming, the acid rain, the smog and other phenomena, adverse to the environment, public health, economic and social activity of countries. The European Union has already adopted Directive (EU) 2016/802, concerning the maritime sector that we will be addressed in this paper, on reducing sulfur dioxide (SO2) emissions from ships. The latter has been incorporated in the Greek legislation with the no.: 128/2016 Joint Ministerial Decision (Government Gazette B '3958). The ever-increasing need to good's transportation, increases the need to create a larger merchant fleet in order to increase global capacity. At the same time, the need for the use of fuels as ship's energy sources, is increasing. Fuels that will be used both for the ship's propulsion and to meet secondary needs, such as the production of electricity and the movement of ship's auxiliary engines, it is necessary to be create in order to meet the global merchant fleet's needs in energy. This increase has the effect of increasing the emissions of gases that are dangerous for the environment and those responsible for a large percentage of global warming and the greenhouse effect. In this paper, the use of hydrogen (H2) as a marine engines' fuel is analyzed and not only. The production of green hydrogen from renewable energy sources is studied and economic factors arising from the production and use of this fuel are analyzed.