In Harry's lifetime on earth he never really connected with the Mother, with Gaia. That is until the very end when she put everything she had left inside of him and sent him off to truly live, to hopefully find the peace he had been striving for and in turn save the life of the planet's Mother who the humans had been...
After the war, Harry had nothing left. For hundreds of years, Harry walks the earth, a planet that he can feel dying under his feet. After meeting Jake Sully and his brother Tom, his life gets tipped upside down. And now, the death of his planet has forced him off and onto a ship to a new planet. OR...