Greencine, though neither Greencine nor Netflix now seem to stock it for rental (you can purchase it for just $12 at the site of its U.S. distributor, Oscilloscope Films), and it is very much worth seeing for two reasons: It tells the story of Dole workers in Nicaragua who were poisoned, made sterile and in some cases killed by chemical pesticides Dole used. The documentary shows that the corporation knew of this and did nothing about it.
Astroturfing experience, in which much money is spent to start a supposedly "grass roots" movement against Gertten and his film. This includes the "paid" muddying of reputations (and conversely, restoring genuinely muddy reputations) by the purchase of anonymous folk who will post on Google whatever their "employer" wants them to say.
Netflix and Amazon Instant Video or purchased on DVD. (You can also purchase the original film at Amazon.) On Netflix (I don't know about the other sources), the streaming includes introductory and closing remarks by lauded documentarian, Alex Gibney, plus an interview with the film's director, Fredrik Gertten.