This is a word used to implicitly criticise someone's environmental stance. There are those who use it to refer to all individuals and groups who express concern about the environment. Others use it only for certain individuals or groups, implying that they are less rationally and more emotionally motivated, or that their arguments and actions are not well thought out and do more harm than good, or perhaps that they give lip service to the environment without inconveniencing themselves in any respect to protect it.