Exactly. Also, they didn't seem to mention the speed difference between typical diesel ship and their proposed "Eco" ship. If it takes a week more that might be

Exactly. Also, they didn't seem to mention the speed difference between typical diesel ship and their proposed "Eco" ship. If it takes a week more that might be fine, but if it takes 5 times as long no one will use it for large scale commercial goods (perhaps there is a niche for transporting "Eco" products)