Unfortunately, we do not yet see zero-emission seagoing vessels, except for a number of experiments on short routes. This requires more innovation and development. Ships are therefore still emitting various substances for the time being. Logical, too, because the ship's engines are tough guys that are needed to cut 90 percent of all equipment worldwide. Nitrogen oxides are one of those substances, although this varies per fuel and/or ship's engine. For example, when burning liquefied natural gas (LNG), a ship emits no less than 80 percent less nitrogen than heavy fuel oil or diesel oil. At the same time, LNG is still a fossil fuel, which means that it remains in conflict with the zero-emission horizon. However, there are more and more engines that are suitable for running on other cleaner fuels.

Shipowners try to sail as cleanly and efficiently as possible, which also saves considerable operational costs. Also in accordance with international regulations, ships must become increasingly cleaner. These regulations are established through negotiations between member states of the International Maritime Organization. That is the UN regulator for global maritime affairs in the field of security, climate and environment. New ships built on or after January 1, 2021 must meet the latest standard: at least a 70 percent reduction in nitrogen emissions compared to the previous generation of ship engines. Ships that do not comply are not allowed to enter the North Sea, Baltic Sea or the coastal waters of the US and Canada.