Well that comes down to the fact that these are extremely complicated issues and can’t be put into a format of predigested baby food that is spoon-fed (the audience). These are complicated issues to wrap your head around, and we knew that. But ultimately the most important thing to us was whether you were emotionally moved at the end of the movie. And on a personal level, I believe that has been accomplished. Yes, a lot of the science is very hard to wrap your head around. But I was very clear in the movie. I want the public to be very scared by what they see. I want them to see a very bleak future. I want them to feel disillusioned halfway through and feel hopeless.
Just think of it as another chapter in Episode IV: A New Hopelessness.