I know. It's old news. I guess I am behind the times. Anyway it looks like the second leading source of pollution in Los Angeles is [drum roll] Hollywood! Yep, the politically correct world of Hollywood is a leading producer of greenhouse gasses (report). The NBC4 article says that LA is wont to increase regulations on Hollywood. It sounds like they will spend taxpayers dollars to clean up after the stars.
I find it humorous that, as the Hollywood elite are banning together to criticize Americans for their consumption, the movie making industry itself has a spotted environmental history.