I just watched it last night. I am not sure what is controversial in the film, but I am not here to argue. It made me think about the hobby and how we, as people who enjoy coral in our homes, should be doing our part to ensure that we are not making the problem worse with our hobby. I for one will be sure to purchase coral that has not removed from the ocean. I don't think there is much we can do about the warming of the ocean at this point unfortunately.