The present study wants to be a legal perspective, analyses of the main legal instruments on climate change in shipping (MARPOL ANEX VI). Since this approach deepens the main technical work of the MEPC (Energy Efficiency Design Index (EEDI); Ship Energy Efficiency Management Plan (SEEMP) and the EU proposals. The difficulties and potential effects on the market are also analyzed. In the field of maritime transport, essentially international, is more effective always universal application of the regulations. From this conviction it is examined the process of legal harmonization and proposes alternative dispute resolution criteria.