The Song of Trees follows the life of an 88-year-old woman who has devoted herself to planting one million trees in the forests of Nicaragua. Believing that every tree has its own language, she lives by the rhythm of the forest, planting trees "to give oxygen back to the Earth." Rather than approaching the climate crisis through abstract arguments, the film reveals how one person's quiet commitment can reconnect humanity with nature. A deeply moving documentary that reminds us planting trees is ultimately an act of planting the future.