The Green Movement has been co-opted, and is heavily allied with the Marxists. That said, there are a lot of airy-fairy well intentioned useful green idiots. The Muslims and the self-declared Marxists are a lot more serious than your average tree-hugger. That's not to say that there aren't fanatic eco-terrorists, of course. Put differently, there are a lot of greenish idiots along for the ride, but there aren't too many "Muslim-ish" Islamists.
The idea that the green movement is made up of a bunch of pushover sissies is actually a misnomer. Environmentalism has its roots in German Romanticism which blew up into Nazism in the 1930’s. Furthermore, when Marxists became green, they are showing themselves moving over to fascism. Fascism is based on nature (see Daniel Gasman’s works on this). Marxism is based on humanism. Many in Germany moved away from Marxism to fascism in the early 20th century.
See also these articles written by the same author - http://www.pittsburghlive.com/x/pittsburghtrib/opinion/s_690815.html & then this one - http://www.aim.org/aim-column/an-ecofascist-crescent-moon-near-ground-zero/.