New technology uses good old-fashioned wind to power giant cargo vessels

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	New technology uses good old-fashioned wind to power giant cargo vessels (npr.org)
	1 points by DemiGuru 989 days ago

1 comments

Likely to be far less energy efficient when compared to conventional cargo vessels

How so? They seem to have done some kind of modeling to determine that it will in fact save fuel, they even predict the payback period.