交通运输是增长速度最快的二氧化碳排放源。美国想通过改变汽车的油耗标签来改变这一现状。
Transportation is the fastest growing source of emissions of carbon dioxide. The U. s. aims to change that with stickers.
炼厂中二氧化碳排放源比较分散，提供热能、蒸汽和电力的过程会大量排放二氧化碳，制氢过程也是二氧化碳的主要来源。
The carbon dioxide emission sources of a refinery are typically widely distributed and large amounts of carbon dioxide will be emitted in the processes of supplying heat, steam and electricity.
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