Shipping on the sea is one of the most polluting industries. It is also not subject to any law– each ship follows the laws of its flag state– so that enforcement is hard. Improving sustainability is driven by logistics and supply chains trying to reduce their pollution footprint, so sustainability may become a competitive edge for shipping companies.
More companies join global alliance to develop sustainable shipping industry | Shipping Tribune.
Supply Chain and Logistics 
This is a point to ponder on. I’ve never thought that maritime eco-sustainability will be something to look forward to in the future but as you’ve mentioned, shipping companies must look into this this matter as early as today because not only will it bring profit for them in the future.
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