Last I checked, there were awards for films. They're called the Academy Awards, or the Oscars. Everyone knows about them, everyone watches (at least part of) them, and they are given for outstanding work on film (at least theoretically; I'm not going to nitpick here...yet).
If there were a Nobel Prize for Film, then maybe. I haven't seen An Inconvenient Truth and I don't intend to. I also haven't read Earth in the Balance and I'm not going to.
But the Nobel Peace Prize is not for film, literature, or even climate change science. Not by any demented stretch of the imagination. That's why it's called the Nobel "Peace" Prize.
He already has the Oscar. I'm not sure I want the Academy of Motion Picture Arts and Sciences dictating who gets the Nobel Peace Prize. It's not actually relevant, but there are people who pay attention.