I just saw the trailer for the upcoming enviro-documentary by Leonardo DiCaprio, Eleventh Hour. So many of these things, especially Al Gore's An Inconvenient Truth, tacked on a message of hope amidst all the dire prognostications. I personally think this is silly.
As I think any environmental scientist will tell you, the delay in cause and effect on global scales, save things such as volcanic eruptions, is large. Decades. If we are seeing the effects of our behavior now, that means these are the effects of causes back in the 1980's.
Basically, this means we're hosed. There is nothing we can do to stop things. We need to start preparing for a very different world in a very short time. I still think all the feel-good environmental stuff is good and important, but it's no longer the most important. That time was 1980, and it's long since past.