The only times that I have ever seen the term "ecofascist" bandied about, it's almost always by wingnutters and anarchocapitalists as a smear term against actual Leftist environmentalists who use the full powers of the state to prevent the former from profiting from fouling up the land and water for everyone else.
Also, plenty of fascists in general cosplay "broadly leftist" positions in order to mask their other culturally reactionary worldviews.