David Orton, writing in Green Web Bulletin #68:
Fascism comes in many forms. Contemporary fascist-type movements (often an alliance of conservative and fascist forces), like the National Front (France), the Republicans (Germany), the Freedom Movement (Austria), the Flemish Block (Belgium), etc., may have ecological concerns, but these are not at the center of the various philosophies and are but one of a number of issues used to mobilize support – for example crime-fighting, globalization and economic competition, alleged loss of cultural identity because of large scale immigration, etc. For any organization which seeks some kind of popular support, even a fascist organization, it would be hard to ignore the environment. But these would be considered “shallow” not defining or “deep” concerns for deep ecology supporters. None of these or similar organizations call themselves ecofascists. (One time German Green Party member, ecologist Herbert Gruhl, who went on to form other political organizations, and to write the popular 1975 book A Planet Is Plundered: The Balance of Terror of Our Politics, did develop what seems to be an intermeshing of ecological and fascist ideas.) While for fascists, the term “fascist” will have positive connotations (of course not for the rest of us), “ecofascist” as used around the environmental and green movements, has no recognizable past or present political embodiment, and has only negative connotations. So the use of the term “ecofascism” in Canada or the United States is meant to convey an insult!
Many supporters of the deep ecology movement have been uncomfortable and on the defensive concerning the question of ecofascism, because of criticism levelled against them, such as for example from some supporters of social ecology, who present themselves as more knowledgeable on social matters. (The term “social ecology” implies this.) This bulletin is meant to change this situation. I will try to show why I have arrived at the conclusion, after investigation, that “ecofascism” has come to be used mainly as an attack term, with social ecology roots, against the deep ecology movement and its supporters plus, more generally, the environmental movement. Thus, “ecofascist” and “ecofascism”, are used not to enlighten but to smear.
Read more here.