The European Sea Ports Organisation (ESPO) welcomes the proposal to include shipping in an Emission Trading System (ETS). Putting a price tag on shipping emissions through the EU ETS should deliver clear climate gains and push the sector to choose greener solutions. However, the effectiveness of this policy will be undermined if evasion of a regional ETS is possible through rerouting of business. Given the international character of shipping, a global market-based measure would be, by far, the most suitable option. Such a global measure would be more difficult to evade, and would entail lower risks for negative competitiveness effects compared to a regional measure. ESPO therefore asks the European Union to increase the pressure on the International Maritime Organization (IMO) to make progress on the development of such a global market-based measure. An alignment between the EU ETS and a market-based measure on the international level should then follow. (....)