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In page Environmental impact of shipping:

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In inland-waters-based applications where sulfur cannot (fully) be removed from the fuel before combustion (desulfurization), flue gas scrubbing is commonly employed. However, this would add weight and cost on ships and produce a further waste stream (usually calcium sulfate if flue gases are scrubbed by being passed through calcium hydroxide solution) which would have to be disposed of, adding yet further cost. In addition, calcium hydroxide commonly being produced by calcination of calcium carbonate releases yet more carbon dioxide into the atmosphere. While this stream is comparatively small in relation to carbon-dioxide emissions caused by combustion of fossil fuels, it needs to be taken into account as well, as part of a complete life-cycle assessment.[citation needed]