Cameron also wanted to show the importance of our connections with one another. "We had to have a common tongue, and we had to have a common accent," he says. "[Actress] Zoe Saldana said it was actually harder to do the accent and to act through the accent than to learn the language."
Cameron credits some of the movie's success to the universality of its messages. "You can overplay how important a movie is in the zeitgeist," he says. "But I do think [this makes an impact] with the environmental message and the idea that we are all kind of connected as human beings to each other."