Silent Running / Молчаливое бегство (1972)

Earth has become a victim of overpopulation, nuclear war and environmental catastrophe, every living thing died there. On board the giant spaceship Valley forge botanist Freeman Lowell for eight years, stores samples of plants from the planet Earth - the ship under huge geodesic domes growing forests, which in the future should be the basis for reforestation in the world. When he learned that his mission was canceled and that the forests are going to be destroyed, and the spacecraft to return to Earth, Freeman breaks all relations with the Earth, and accompanied by two robots, Huey and Dewey, goes to Saturn's rings.