According to Frances Ardmore, Earth is a dying planet by the year 2170 due to various reasons including deforestation, resource depletion, air pollution, famine, human overpopulation and mass flooding, causing humans and animals to face extinction, with most large animals (megafauna) already long extinct.
According to Jake, one of the main characters, the Earth is a "dying world" where humans have "killed their mother", suggesting that there is very little, if any, functioning natural ecosystem left.
Humans (Na'vi name: sawtute meaning "sky people") are a sapient, bipedal, mammalian dominant species native to planet Earth, who by the 22nd century has become a technologically advanced species capable of interstellar travel and colonization.
Lifespan. Although lifespan data is incomplete, it is estimated Na'vi live 30% longer than the average human. Once born, Na'vi children mature more rapidly than humans.
What Happened to Earth During the Events of Avatar? | James Cameron's Avatar
Can Navi breathe earth air?
They briefly touch on this in the movie but I wish they elaborated a bit more on it. Humans can last 10 seconds breathing na'vi air, but na'vi can breathe human air for much longer than that but they still at some point need a mask to help them breathe regular human air.
Pandora's air is unbreathable due to high levels of carbon dioxide and trace amounts of hydrogen sulfide, posing a threat to humans. Humans use exopacks and avatar bodies to survive and explore Pandora's toxic atmosphere, but these solutions have limitations and challenges.
In Cameron's script she's introduced with the descriptor "in human age she would be 18," but that raises as many questions as it answers. As with the math that leads to Jake being 28, Neytiri's birth in the Earth calendar year 2136 and the film's setting in 2154 add up to make her 18, but that's by Earth standards.
By 2170, Earth has become a near-inhospitable planet and Mars is still not terraformed enough to sustain a large human population, sparking the recolonization of Pandora and the construction of Bridgehead.
The Na'vi Will Visit Earth As Redeemers, Not Conquerors
But Kiri is the key to the Avatar saga. Cameron deliberately surrounds this character with Messianic imagery, complete with a miraculous conception; her mystical experience (or, as human science would put it, her epileptic seizure) is analogous to a baptism.
Pandora is an inner satellite of Saturn. It was discovered in 1980 from photos taken by the Voyager 1 probe and was provisionally designated S/1980 S 26. In late 1985, it was officially named after Pandora from Greek mythology. It is also designated as Saturn XVII.
No known Avatars were assassinated. Aang was frozen in an iceberg for a century, which took a physical toll on him that led to his death at 66. Kyoshi lived to be 230, when it's likely she died of very, very old age.
At any time there is only a single Avatar, who is the spirit of the world incarnated into human form. When the Avatar dies, the Avatar Spirit is reincarnated into a newborn, who becomes the next Avatar. Each nation has a method of recognizing the new Avatar.
It was only when Lo'ak insisted that Neteyam agreed to the rescue. Neteyam risked his life and perished in order to save Lo'ak and Spider from Quaritch. As Jake himself said: "A son for a son". Spider wept for Neteyam as he died as well.
Jemaine Clement as Dr. Ian Garvin, a marine biologist. Britain Dalton as Lo'ak, Jake and Neytiri's second son and the narrator of the film. Trinity Jo-Li Bliss as Tuktirey ("Tuk"), Jake and Neytiri's eight-year-old daughter and their youngest child.
Her father is not a father, her father is another mother, Eywa, the Great Mother, the sentient life force of Pandora itself that exists in all things there, but is rarely understood. So essentially yes, Kiri was born from Eywa just like Anakin Skywalker was allegedly conceived by the Force itself and its midichlorians.
Lo'ak te Suli Tsyeyk'itan is the fourteen-year-old son of Jake Sully and Neytiri, the younger brother of Neteyam, the older brother of his only biological youngest sister, Tuktirey, and the younger adoptive brother of Kiri.
Kiri is a young Na-vi around fourteen years of age. Since she was conceived through an avatar body (a genetically engineered human/Na'vi-hybrid body, designed to serve as a remotely controlled vessel for a human mind) she was born with human-like traits, such as eyebrows and five fingers instead of four.
In some ways, he's the new Jake, a human caught up in the Na'vi world. But Spider has no avatar—a genetically engineered hybrid body used to freely roam Pandora—so he must navigate his habitat with an oxygen mask, always at a disadvantage compared with his blue friends.
Smell. The dewy aroma that first hits you when arriving at Pandora is a mix between a fresh-cut lawn and the smell after it rains on a warm day; however, the scents here change.
The Na'vi characters might walk Earth as the native species in Avatar 5 if a two-way Recombinant procedure is possible. Human Recombinants could be grown in future movies to allow a Na'vi consciousness to survive on Earth indefinitely.
