Green ferry emits more CO2 than diesel
This is a Arran news story, published by BBC, that relates primarily to Glen Sannox news.
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fuel ferryBBC
•Glen Sannox: 'Green' ferry has higher emissions than diesel ship
77% Informative
MV Glen Sannox will emit 10,391 equivalent tonnes of CO2 a year compared with 7,732 for Caledonian Isles .
The dual-fuel ferry has more car capacity but requires larger engines which also emit methane.
LNG fuel mostly consists of methane, a greenhouse gas with a greater global warming effect than CO2.
Ferries procurement agency CMAL , which owns the ship, said the comparison was "inaccurate".
Ferry operator CalMac said passenger and vehicle numbers on the Arran route had increased significantly over the past 30 years .
The figures are based on ideal engine running conditions - and CalMac acknowledges that in real-life operations, emissions are likely to be higher.
The analysis also does not factor in so-called "blowdown" emissions of methane which occur every time the ship switches from LNG to running on MGO .
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