I don't know. I don't want to be pessimistic just for the sake of being a devil's advocate (or worse), which I can be prone to do. There is clearly good stuff in this film.
I don't agree that methane is such a big problem -- it's radiative forcing is only 1/4th that of CO2's -- it just seems easier to focus on than CO2.
And I don't see that carbon sequestration is anywhere near economical enough to make sense doing.
So I guess I don't see solutions as at hand as this film -- at least the trailer -- is trying to imply.