In the movie "Avatar" which was written and directed by James Cameron, two societies collide. Thehumans have abandoned a dying Earth and invaded the planet of the "Na'vi." Pandora has mineral and deposits that the human race wants for profit. Scientist develop "Avatars" which look like the "Na'vi" and have "drivers." Jake Sully's brother was killed in a botched robbery. Since Jake was an identical twin, he agreed to become the driver for his brother's Avatar.
Jake becomes part of the Na'vi people and learns to see a connection between the people and the earth. He tries to save the Mother Tree for the Na'vi but fails. He then joins them for a final battle and the invading humans are repelled and expelled from Pandora.
The themes in "Avatar" are the destruction of land and people for natural resources and the invasion of a country for greed and profit. We have a sub theme of environmentalism running throughout the movie.
"The film is set in the year 2154, when humans are mining a precious mineral called unobtanium on the lush moon Pandora in the Alpha Centauri star system. The mining colony's expansion threatens the continued existence of a local tribe of Na'vi—a sentient humanoid species which is indigenous to Pandora. The film's title refers to the genetically engineered Na'vi bodies used by several human characters to interact with the natives of Pandora."
The 2009 film Avatar was both written and directed by the legendary James Cameron. The project began as an eighty-page treatment in 1994, with the intention of the film being made after Titanic had been completed. This agenda was postponed, and it took Cameron another twelve years--working between other major projects--to get started on the writing of the screenplay; once he did begin working, the script was completed within four months.
The film's primary theme is that of the consequences of imperialism. The plot bears witness to the oppression of an indigenous population, the Na'vi, at the hands of humans. Cameron himself has stated that the film is "certainly about imperialism in the sense that the way human history has always worked is that people with more military or technological [sic] might tend to supplant or destroy people who are weaker, usually for their resources."
The problems tackled within the film include an energy crisis on Earth as a result of a depletion of natural resources, the extraterrestrial mining of unobtanium on the planet of Pandora, and the potential extermination of the Na'vi way of life because of this practice.