Freight is dirty business. It's relatively efficient, but it relies on low grade fuel, and lots of it. Using a large ship as an example--the Emma Maersk, a container ship which can cary 11,000 TEUs, consumes about 1,660 gallons of fuel per hour when cruising. I'd like to make boats that take advantage of the wind to bring that number near zero while delivering goods almost as quickly.
I always find it funny how ancient technology seems to completely slip the minds of the vast-majority... e.g. that something like huge cargo-ships could be as common as they are and *not* be wind-powered... yet, I didn't think of it, either!
Combining today's technologies with sailing ships... I dig it.
It'd be an awesome future if sailing-cargo-ships replaced fuel-guzzlers!