Comment by sigmoid10

Not really. The whole shipping industry accounts for 90% of the world's transportation of goods, but only 3% of greenhouse gas emissions. The problem with big ships is that they burn crude oil and create insane amounts of NOx and Sulphur pollution. Propellers won't solve that issue, only international regulations can. The industry also grows by several percent each year, so the best thing a small improvement like this could do is counter a few years of growth at best.