the fact of being green in colour 带绿色的；浅绿色的 the greenness of the countryside 乡村的青葱翠绿
the fact of being covered with grass or other plants 长满青草的；绿油油的；青葱的 A warming trend on Arctic land causes an increase in greenness. 北极地区的变暖趋势导致绿色度增加。
the fact of supporting or promoting the protection of the environment