Lowering speeds at sea is one of several factors that reduce the pollution resulting from the shipping industry. International shipping faces major environment-related challenges. Currently, the average age of cargo ships world-wide is 18 years. Rebuilding old engines can also be helpful. Operational adjustments such as lower cruising speeds at sea can have a significant effect.
High speeds result in considerably higher emissions than low speeds.
Emission quotas represent a possible approach, but it will take considerable time to gain acceptance for this solution. Any directive from the IPCC on emissions related to the shipping industry will be an important stimulus for environment-related adjustments for all transport at sea.