Companies are increasingly aware of their carbon footprint and are taking steps to minimize it.

carbon的意思是"碳"，指一种化学元素，是构成有机物的基础成分。 footprint的本义是"脚印、足迹"，引申为"影响、痕迹"。 carbon footprint指个人或组织在活动中产生的二氧化碳排放总量，用来衡量对环境的影响程度。