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"But something that has this spoonful of sugar of all the action and the adventure and all that, which thrills me anyway as a fan, but also wanting to do something that has a conscience, that maybe in the enjoying of it makes you think a little bit about the way you interact with nature and your fellow man."

It may seem like a simple story about "nasty" humans fighting with "those beautifully, spiritually evolved Navi," he said. "But it's really not, because we make science fiction as human beings for human consumption."

"It means the Navi represent something that is our higher selves, or our aspirational selves, what we would like to think we are or maybe what we realise we're losing," he said. "And the humans in the film, even though there are some good ones salted in, represent what we know to be the parts of ourselves that are trashing our world and maybe condemning ourselves to a grim future."