See Joe Romm’s repost to Klein:

No, Naomi Klein And Salon, ‘Denialism’ By Enviros Has Not Been ‘More Damaging Than The Right-Wing Denialism’

Romm has a handy image with which he dispute’s Klein’s claim that Green Groups are more damaging than right-wing climate change denial.  I’d opine: not more damaging, no, that is clearly an overstatement.  But Klein’s general criticism of the big corporatized environmental groups is on-target.