Natural gas is a transport fuel which may help reduce greenhouse gas emissions in shipping and trucks. However, there is some disagreement regarding the potential for natural gas to provide significant improvements relative to current ships and trucks. In 2015, road freight represented ~7% of global energy related CO 2 emissions, with international shipping representing ~2.6% of global emissions. These emissions are also expected to grow, with some estimates suggesting road freight emission growing by a third, and shipping emissions growing by between 50% and 250% from 2012 to 2050, making absolute emissions reductions challenging. In addition, reducing emissions in ships and trucks has proved technically difficult given the relatively long distances that ships and trucks travel. This paper documents a systematic review of literature detailing well-to-wheel/wake greenhouse gas emissions and economic costs in moving from diesel and heavy fuel oil to natural gas a...

中文翻译：

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卡车和轮船的天然气燃料和温室气体排放

天然气是一种运输燃料，可以帮助减少船运和卡车的温室气体排放。但是，相对于当前的船舶和卡车，天然气在提供重大改进方面的潜力存在一些分歧。2015年，公路货运约占全球能源相关CO 2排放量的7％，而国际航运约占全球排放量的2.6％。预计这些排放量还将增长，一些估计表明，从2012年到2050年，公路货运排放量将增长三分之一，而船舶排放量将增长50％至250％，这使得绝对减排量具有挑战性。另外，鉴于船舶和卡车行驶的距离较长，在技术上证明减少船舶和卡车的排放是困难的。