This question reminds me of the ecology/"brown marxism" clash. Ecology--like feminism--on its own can not really not come to terms with the nature of the crisis, which is imbedded in the accumulation of capital. Marxism which shuns ecology as a "middle class" diversion from the working-class struggle is doomed to irrelevancy. A synthesis is required between the green and the red, just as there is between Marxism and feminism.
Louis Proyect
(http://www.panix.com/~lnp3/marxism.html)