According to [0], a typical container ship generate 12.5 g of CO2 per ton per km, which means that one trip from France to NY with 350T of cargo would release about 35T of CO2 in the atmosphere.
I'm convinced that this sail boat generates an order of magnitude less of that (I can't find any estimate of it)
Whatever the initial CO2 cost of the construction of this boat is, I'm sure that it's a net benefits if it's used long enough
1.8 is lower than 3g. If those aims are reached I guess they are "more green" than I thought. But the gain is quite small, if you truck that cargo for 160km all the CO2 savings are gone. A modern truck emits 45g of CO2 per km.
It doesn't really make sense to compare a 350T sail boat with a super tanker, a comparable diesel boat produce 36g per ton per km(according to the same report), the "grain de sail II" aims to replace those, and the gains are huge.
I'm convinced that this sail boat generates an order of magnitude less of that (I can't find any estimate of it)
Whatever the initial CO2 cost of the construction of this boat is, I'm sure that it's a net benefits if it's used long enough
[0]: https://www.ecsa.eu/sites/default/files/publications/2020%20...