I also liked this documentary "Forest Man" https://www.youtube.com/watch?v=HkZDSqyE1do

"Since the 1970's Majuli islander Jadav Payeng has been planting trees in order to save his island. To date he has single handedly planted a forest larger than Central Park NYC. His forest has transformed what was once a barren wasteland, into a lush oasis. "