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It's tricky with today's sail-powered boats. They're very expensive to buy and maintain, but nearly all their fuel is free. They're rich man's toys but sort of green. Things may improve when the cargo shipping industry reverts to wind power https://www.maritime-executive.com/article/wallenius-and-alfa-laval-proceed-with-jv-to-develop-wind-propulsion
nick_h.
You don't really need to, because the market has already done it for you. Price is an excellent first order proxy for aggregate resource depletion, so the cheapest is usually the greenest. If you want to get into the weeds, you should probably adjust for market distorting taxes, subsidies and regulations, but ain't nobody got time for that.