Very little to do with global warming, more of a psychological film
This film was more about what would happen to 6 people locked in a steam room. The film seems to be incorrectly billed as some kind of global warming wake up call. It really has no global warming message whatsoever.
I didn't really get the ending though, was the story made up or did it already happen? I'm guessing it was pure fantasy since some of the cast were his doctors in the mental ward.