An expanding demand for more environmentally-friendly ships and a shrinking supply of traditional fuels is spurring the development of new marine propulsion technologies, as Jim Shaw explains.rnEmerging new technologies in today's maritime industry are not as easy to spot as when sail gave way to steam well over a century ago, but a number of changes are taking place in the way ships are designed, built and operated, almost all to try to provide a healthier environment while taking into account the shrinking supply of fuel.rnIn a recent seminar on Shipping and Global Environment, Henrik Madsen, president and chief executive officer of classification society Det Norske Veritas, noted that modern shipping accounts for two per cent of the global share of CO_2 emissions, as well as four to nine per cent of sulphur oxide (SOx) emissions and about ten to 15 per cent of nitrogen oxide (NOx) emissions. These emissions are expected to increase as energy use in shipping expands by 40 per cent to possibly 80 per cent over the next dozen years.
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机译：正如吉姆·肖（Jim Shaw）解释的那样，对更加环保的船舶的需求不断增长以及传统燃料供应的减少正在刺激新的船舶推进技术的发展。当今海事行业中新兴的新技术并不像帆让路那样容易发现。在一个多世纪前就已经蒸蒸日上，但是船舶的设计，建造和操作方式正在发生许多变化，几乎所有这些变化都是为了在考虑燃料供应减少的情况下提供一个更健康的环境。航运与全球环境部船级社总裁Det Norske Veritas的亨里克·马德森（Henrik Madsen）指出，现代航运占全球CO_2排放量的2％，以及四氧化二硫（SOx）的4％至9％ ）排放量和氮氧化物（NOx）排放量的10％到15％。在未来十二年中，随着运输中的能源使用量增加40％，甚至可能达到80％，这些排放预计会增加。
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