If he was a true believer his yacht would be powers by sail, he would ditch his cars for public transportation, he’d power his house completely with solar, and he’d share his mansions with hundreds of Syrian refugees.
Since he won’t do the right thing, he should be disqualified from making movies.
If he were a "True Believer" in Global Warming, he would not be developing his private island in Belize. HOT & HUMID there, most of the year!