ecofreak

ecofreak

(ˈiːkəʊˌfriːk)
n
(Environmental Science) an environmentalist or a person who is devoted to environmental issues

ecofreak

A militant environmentalist, especially one considered as excessive.
References in periodicals archive ?
Like you could hold up a picture of a typical downtown city block and ask, "What's missing here?" and only an ecofreak or tree sapper would say, "Trees." Everyone else would say, "A McDonald's?"
Indeed, it could be argued that homegrown ecofreaks caused even more widespread harm by leading the campaign against DDT (one of the most effective pesticides created to date), which was banned in 1972 by the Environmental Protection Agency.
It's no longer for the "ecofreaks" alone, Cook says.