adding a sail mechanism to a freight ship can improve efficiency up to 50% under ideal circumstances (10-30% is considered more normal)
now available at your local freight shipyard retailer
i imagine the uptake rate on this will be quite high, since the return on investment should be pretty quick.
it makes me wonder why somebody didn't think of it 50 years ago and what similar ideas exist that nobody is pursuing today.
steam powered trains?
biomass powered transportation?